1) one burning with zeal, a zealot
2) used of God as jealous of any rival and sternly vindicating his control
3) most eagerly desirous of, zealous for, a thing
3a) to acquire a thing, (zealous of)
3b) to defend and uphold a thing, vehemently contending for a thing
Part of Speech: noun masculine
Citing in TDNT: 2:882, 297
From G2206; a "zealot": - zealous.
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 ζηλωτής; click on the second column to search for that grammatical form of the root ζηλωτής; click on the third column to search for that word and grammatical form; click on the total to search for the root ζηλωτής.