1) to be a herald, to officiate as a herald
1a) to proclaim after the manner of a herald
1b) always with the suggestion of formality, gravity and an authority which must be listened to and obeyed
2) to publish, proclaim openly: something which has been done
3) used of the public proclamation of the gospel and matters pertaining to it, made by John the Baptist, by Jesus, by the apostles and other Christian teachers
Part of Speech: verb
Citing in TDNT: 3:697, 430
Of uncertain affinity; to herald (as a public crier), especially divine truth (the gospel): - preach (-er), proclaim, publish.
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root κηρύσσω; click on the second column to search for that grammatical form of the root κηρύσσω; click on the third column to search for that word and grammatical form; click on the total to search for the root κηρύσσω.