Bible Dictionary Definition of devil:

1228 διάβολος (diabolos, pronounced dee-AH-bo-los)
Literal meaning: accuser, prosecutor, slanderer, false accuser
Word breakdown: from "diabalo" (to backbite/slander, accuse, or give hostile information)

1139 δαιμονιζομαι daimonizomai dahee-mon-id'-zom-ahee
1) to be under the power of a demon.
In the NT, these are persons, afflicted with especially severe diseases, either bodily or mentally, (such as paralysis, blindness, deafness, loss of speech, epilepsy, melancholy, insanity, etc.) whose bodies in the opinion of the Jews demons had entered, and so held possession of them as not only to afflict them with ills, but also to dethrone the reason and take its place themselves; accordingly the possessed were wont to express the mind and consciousness of the demons dwelling in them; and their cure was thought to require the expulsion of the demon.

1140 δαιμονιον daimonion dahee-mon'-ee-on
1) the divine power, deity, divinity
2) a spirit, a being inferior to God, superior to men
3) evil spirits or the messengers and ministers of the devil

1141 δαιμονιωδης daimoniodes dahee-mon-ee-o'-dace
1) resembling or proceeding from an evil spirit, demon-like 

1142 δαιμων daimon dah'-ee-mown
1) a god, a goddess
1a) an inferior deity, whether good or bad
2) in the NT, an evil spirit

Examples of devil from KJV:

Matthew 4:1 Then was Jesus led up of the Spirit into the wilderness to be tempted of the devil <1228>.
Matthew 4:5 Then the devil <1228>. taketh him up into the holy city, and setteth him on a pinnacle of the temple,
Matthew 4:8 Again, the devil <1228>. taketh him up into an exceeding high mountain, and sheweth him all the kingdoms of the world, and the glory of them;
Matthew 4:11 Then the devil <1228>. leaveth him, and, behold, angels came and ministered to him.
Matthew 4:24 And his fame went throughout all Syria: and they brought to him all sick people that were taken with divers diseases and torments, and those which were possessed with devils <1139>, and those which were lunatick, and those that had the palsy; and he healed them.
Matthew 7:22 Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils <1140>? and in thy name done many wonderful works?
Matthew 8:16 When the even was come, they brought to him many that were possessed with devils <1139>: and he cast out the spirits with his word, and healed all that were sick:
Matthew 8:28 And when he was come to the other side into the country of the Gergesenes, there met him two possessed with devils <1139>, coming out of the tombs, exceeding fierce, so that no man might pass by that way.
Matthew 8:33 And they that kept them fled, and went their ways into the city, and told every thing, and what was befallen to the possessed of the devils <1139>.
Matthew 8:31 So the devils <1142> besought him, saying, If thou cast us out, suffer us to go away into the herd of swine.
Matthew 9:32 As they went out, behold, they brought to him a dumb man possessed with a devil <1139>.
Matthew 9:33 And when the devil <1139> was cast out, the dumb spake: and the multitudes marvelled, saying, It was never so seen in Israel.
Matthew 9:34 But the Pharisees said, He casteth out devils <1140> through the prince of the devils <1140>.
Matthew 10:8 Heal the sick, cleanse the lepers, raise the dead, cast out devils <1140>: freely ye have received, freely give.
Matthew 11:18 For John came neither eating nor drinking, and they say, He hath a devil <1140>.
Matthew 12:22 Then was brought to him one possessed with a devil <1139>, blind, and dumb: and he healed him, insomuch that the blind and dumb both spake and saw.
Matthew 13:39 The enemy that sowed them is the devil <1140>; the harvest is the end of the world; and the reapers are the angels.
Matthew 12:24 But when the Pharisees heard it, they said, This fellow doth not cast out devils <1140>, but by Beelzebub the prince of the devils <1140>.
Matthew 12:27 And if I by Beelzebub cast out devils <1140>, by whom do your children cast them out? therefore they shall be your judges.
Matthew 12:28 But if I cast out devils <1140> by the Spirit of God, then the kingdom of God is come to you.
Matthew 15:22 And, behold, a woman of Canaan came out of the same coasts, and cried to him, saying, Have mercy on me, O Lord, thou Son of David; my daughter is grievously vexed with a devil <1139>.
Matthew 17:18 And Jesus rebuked the devil <1140>; and he departed out of him: and the child was cured from that very hour.
Matthew 25:41 Then shall he say also to them on the left hand, Depart from me, ye cursed, into everlasting fire, prepared for the devil <1228> and his angels:
Mark 1:32 And at even, when the sun did set, they brought to him all that were diseased, and them that were possessed with devils <1139>.
Mark 1:34 And he healed many that were sick of divers diseases, and cast out many devils <1140>; and suffered not the devils <1140> to speak, because they knew him.
Mark 1:39 And he preached in their synagogues throughout all Galilee, and cast out devils <1140>.
Mark 3:15 And to have power to heal sicknesses, and to cast out devils <1140>:
Mark 3:22 And the scribes which came down from Jerusalem said, He hath Beelzebub, and by the prince of the devils <1140> casteth he out devils <1140>.
Mark 5:12 And all the devils <1142> besought him, saying, Send us into the swine, that we may enter into them.
Mark 5:15 And they come to Jesus, and see him that was possessed with the devil <1139>, and had the legion, sitting, and clothed, and in his right mind: and they were afraid.
Mark 5:16 And they that saw it told them how it befell to him that was possessed with the devil <1139>, and also concerning the swine.
Mark 5:18 And when he was come into the ship, he that had been possessed with the devil <1139> prayed him that he might be with him.
Mark 6:13 And they cast out many devils <1140>, and anointed with oil many that were sick, and healed them.
Mark 7:26 The woman was a Greek, a Syrophenician by nation; and she besought him that he would cast forth the devil <1140> out of her daughter.
Mark 7:29 And he said to her, For this saying go thy way; the devil <1140> is gone out of thy daughter.
Mark 7:30 And when she was come to her house, she found the devil <1140> gone out, and her daughter laid upon the bed.
Mark 9:38 And John answered him, saying, Master, we saw one casting out devils <1140> in thy name, and he followeth not us: and we forbad him, because he followeth not us.
Mark 16:9 Now when Jesus was risen early the first day of the week, he appeared first to Mary Magdalene, out of whom he had cast seven devils <1140>.
Mark 16:17 And these signs shall follow them that believe; In my name shall they cast out devils <1140>; they shall speak with new tongues;
Luke 4:2 Being forty days tempted of the devil <1228>. And in those days he did eat nothing: and when they were ended, he afterward hungered.
Luke 4:3 And the devil <1228> said to him, If thou be the Son of God, command this stone that it be made bread.
Luke 4:5 And the devil <1228>, taking him up into an high mountain, shewed to him all the kingdoms of the world in a moment of time.
Luke 4:6 And the devil <1228> said to him, All this power will I give thee, and the glory of them: for that is delivered to me; and to whomsoever I will I give it.
Luke 4:13 And when the devil <1228> had ended all the temptation, he departed from him for a season.
Luke 4:33 And in the synagogue there was a man, which had a spirit of an unclean devil <1140>, and cried out with a loud voice,
Luke 4:35 And Jesus rebuked him, saying, Hold thy peace, and come out of him. And when the devil <1140> had thrown him in the midst, he came out of him, and hurt him not.
Luke 7:33 For John the Baptist came neither eating bread nor drinking wine; and ye say, He hath a devil <1140>.
Luke 8:2 And certain women, which had been healed of evil spirits and infirmities, Mary called Magdalene, out of whom went seven devils <1140>,
Luke 8:12 Those by the way side are they that hear; then cometh the devil <1228>, and taketh away the word out of their hearts, lest they should believe and be saved.
Luke 8:27 And when he went forth to land, there met him out of the city a certain man, which had devils <1140> long time, and ware no clothes, neither abode in any house, but in the tombs.
Luke 8:29 (For he had commanded the unclean spirit to come out of the man. For oftentimes it had caught him: and he was kept bound with chains and in fetters; and he brake the bands, and was driven of the devil <1142> into the wilderness.)
Luke 8:30 And Jesus asked him, saying, What is thy name? And he said, Legion: because many devils <1140> were entered into him.
Luke 8:33 Then went the devils <1140> out of the man, and entered into the swine: and the herd ran violently down a steep place into the lake, and were choked.
Luke 8:35 Then they went out to see what was done; and came to Jesus, and found the man, out of whom the devils <1140> were departed, sitting at the feet of Jesus, clothed, and in his right mind: and they were afraid.
Luke 8:36 They also which saw it told them by what means he that was possessed of the devils <1139> was healed.
Luke 8:38 Now the man out of whom the devils <1140> were departed besought him that he might be with him: but Jesus sent him away, saying,
Luke 9:1 Then he called his twelve disciples together, and gave them power and authority over all devils <1140>, and to cure diseases.
Luke 9:42 And as he was yet a coming, the devil <1140> threw him down, and tare him. And Jesus rebuked the unclean spirit, and healed the child, and delivered him again to his father.
Luke 9:49 And John answered and said, Master, we saw one casting out devils <1140> in thy name; and we forbad him, because he followeth not with us.
Luke 10:17 And the seventy returned again with joy, saying, Lord, even the devils <1140> are subject to us through thy name.
Luke 11:14 And he was casting out a devil <1140>, and it was dumb. And it came to pass, when the devil <1140> was gone out, the dumb spake; and the people wondered.
Luke 11:15 But some of them said, He casteth out devils <1140> through Beelzebub the chief of the devils <1140>.
Luke 11:18 If Satan also be divided against himself, how shall his kingdom stand? because ye say that I cast out devils <1140> through Beelzebub.
Luke 11:19 And if I by Beelzebub cast out devils <1140>, by whom do your sons cast them out? therefore shall they be your judges.
Luke 11:20 But if I with the finger of God cast out devils <1140>, no doubt the kingdom of God is come upon you.
Luke 13:32 And he said to them, Go ye, and tell that fox, Behold, I cast out devils <1140>, and I do cures to day and to morrow, and the third day I shall be perfected.
John 6:70 Jesus answered them, Have not I chosen you twelve, and one of you is a devil <1228>?
John 7:20 The people answered and said, Thou hast a devil <1140>: who goeth about to kill thee?
John 8:44 Ye are of your father the devil <1228>, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it.
John 8:48 Then answered the Jews, and said to him, Say we not well that thou art a Samaritan, and hast a devil <1140>?
John 8:49 Jesus answered, I have not a devil <1140>; but I honour my Father, and ye do dishonour me.
John 8:52 Then said the Jews to him, Now we know that thou hast a devil <1140>. Abraham is dead, and the prophets; and thou sayest, If a man keep my saying, he shall never taste of death.
John 10:20 And many of them said, He hath a devil <1140>, and is mad; why hear ye him?
John 10:21 Others said, These are not the words of him that hath a devil <1139>. Can a devil <1140> open the eyes of the blind?
John 13:2 And supper being ended, the devil <1228> having now put into the heart of Judas Iscariot, Simon's son, to betray him;
Acts 10:38 How God anointed Jesus of Nazareth with the Holy Ghost and with power: who went about doing good, and healing all that were oppressed of the devil <1228>; for God was with him.
Acts 13:10 And said, O full of all subtilty and all mischief, thou child of the devil <1228>, thou enemy of all righteousness, wilt thou not cease to pervert the right ways of the Lord?
Acts 17:18 Then certain philosophers of the Epicureans, and of the Stoicks, encountered him. And some said, What will this babbler say? other some, He seemeth to be a setter forth of strange gods <1140>: because he preached to them Jesus, and the resurrection.
1 Corinthians 10:20 But I say, that the things which the Gentiles sacrifice, they sacrifice to devils <1140>, and not to God: and I would not that ye should have fellowship with devils <1140>.
1 Corinthians 10:21 Ye cannot drink the cup of the Lord, and the cup of devils <1140>: ye cannot be partakers of the Lord's table, and of the table of devils <1140>.
1 Timothy 4:1 Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils <1140>;
James 2:19 Thou believest that there is one God; thou doest well: the devils <1140> also believe, and tremble.
Revelation 9:20 And the rest of the men which were not killed by these plagues yet repented not of the works of their hands, that they should not worship devils <1140>, and idols of gold, and silver, and brass, and stone, and of wood: which neither can see, nor hear, nor walk:

Ephesians 4:27 Neither give place to the devil <1228>.
Ephesians 6:11 Put on the whole armour of God, that ye may be able to stand against the wiles of the devil <1228>.
1 Timothy 3:6 Not a novice, lest being lifted up with pride he fall into the condemnation of the devil <1228>.
1 Timothy 3:7 Moreover he must have a good report of them which are without; lest he fall into reproach and the snare of the devil <1228>.
2 Timothy 2:26 And that they may recover themselves out of the snare of the devil <1228>, who are taken captive by him at his will.
Hebrews 2:14 Forasmuch then as the children are partakers of flesh and blood, he also himself likewise took part of the same; that through death he might destroy him that had the power of death, that is, the devil <1228>;
James 3:15 This wisdom descendeth not from above, but is earthly, sensual, devilish <1141>.
James 4:7 Submit yourselves therefore to God. Resist the devil <1228>, and he will flee from you.
1 Peter 5:8 Be sober, be vigilant; because your adversary the devil <1228>, as a roaring lion, walketh about, seeking whom he may devour:
1 John 3:8 He that committeth sin is of the devil <1228>; for the devil <1228> sinneth from the beginning. For this purpose the Son of God was manifested, that he might destroy the works of the devil <>.
1 John 3:10 In this the children of God are manifest, and the children of the devil <1228>: whosoever doeth not righteousness is not of God, neither he that loveth not his brother.
Jude 1:9 Yet Michael the archangel, when contending with the devil <1228> he disputed about the body of Moses, durst not bring against him a railing accusation, but said, The Lord rebuke thee.
Revelation 2:10 Fear none of those things which thou shalt suffer: behold, the devil <1228> shall cast some of you into prison, that ye may be tried; and ye shall have tribulation ten days: be thou faithful to death, and I will give thee a crown of life.
Revelation 12:9 And the great dragon was cast out, that old serpent, called the devil <1228>, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him.
Revelation 12:12 Therefore rejoice, ye heavens, and ye that dwell in them. Woe to the inhabiters of the earth and of the sea! for the devil <1228> is come down to you, having great wrath, because he knoweth that he hath but a short time.
Revelation 16:14 For they are the spirits of devils <1142>, working miracles, which go forth to the kings of the earth and of the whole world, to gather them to the battle of that great day of God Almighty.
Revelation 18:2 And he cried mightily with a strong voice, saying, Babylon the great is fallen, is fallen, and is become the habitation of devils <1142>, and the hold of every foul spirit, and a cage of every unclean and hateful bird.
Revelation 20:2 And he laid hold on the dragon, that old serpent, which is the devil <1228>, and Satan, and bound him a thousand years,
Revelation 20:10 And the devil <1228> that deceived them was cast into the lake of fire and brimstone, where the beast and the false prophet are, and shall be tormented day and night for ever and ever.