There is no one-word translation that really carries the meaning of kerugma. It could be translated as any of the following:

1. utterance containing the essence of Christ
2. Christ-filled proclamation
3. impartation of Christ through proclamation

While kerugma is often translated as preach, this doesn't really get at the meaning of the word. Vine's says: “The substance of what is preached as distinct from the act of preaching.” Strongs says: "(1) that which is proclaimed by a herald or public crier, a proclamation by herald (2) in the NT the message or proclamation of the heralds of God or Christ" These come closer to the meaning.

Note that Strongs doesn't say, "heralds of thoughts about God or Christ." Strong's says: "heralds of God or Christ" That is, the essence of God, the essence of Christ, is contained in the utterance. By the context of how kerugma is used in the New Testament, we can see that this isn't a kind of preaching that proceeds from human reasoning. It is the Utterance of Christ that is spoken by the Holy Spirit and contains the Power and Presence of Christ Himself.

"A message that is preached about Jesus Christ comes from a man’s intellect and contains man’s precepts and opinions about Him. That kind of preaching brings very little or no spiritual change at all to the listener. The kerugma, on the other hand, is a proclamation that carries with it the life and attributes of the Lord Jesus Christ, and by it hearers can experience His life. The Gospel, then, is not a message about Jesus Christ, but an impartation of Him to the hearer" Open Heaven Ministries