1) a fight or combat
1a) of those in arms, a battle
1b) of persons at variance, disputants etc., strife, contention
1c) a quarrel
Part of Speech: noun feminine
Citing in TDNT: 4:527, 573
From G3164; a battle, that is, (figuratively) controversy: - fighting, strive, striving.
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 μάχη; click on the second column to search for that grammatical form of the root μάχη; click on the third column to search for that word and grammatical form; click on the total to search for the root μάχη.