1) that which is or has been uttered by the living voice, thing spoken, word
1a) any sound produced by the voice and having definite meaning
1b) speech, discourse
1b1) what one has said
1c) a series of words joined together into a sentence (a declaration of one's mind made in words)
1c1) an utterance
1c2) a saying of any sort as a message, a narrative
1c2a) concerning some occurrence
2) subject matter of speech, thing spoken of
2a) so far forth as it is a matter of narration
2b) so far as it is a matter of command
2c) a matter of dispute, case at law
Part of Speech: noun neuter
Citing in TDNT: 4:69, 505
From G4483; an utterance (individually, collectively or specifically); by implication a matter or topic (especially of narration, command or dispute); with a negative naught whatever: - + evil, + nothing, saying, word.
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 ῥῆμα; click on the second column to search for that grammatical form of the root ῥῆμα; click on the third column to search for that word and grammatical form; click on the total to search for the root ῥῆμα.