1a) an underrower, subordinate rower
1b) any one who serves with hands: a servant
1b1) in the NT of the officers and attendants of magistrates as - of the officer who executes penalties
1b2) of the attendants of a king, servants, retinue, the soldiers of a king, of the attendant of a synagogue
1b3) of any one ministering or rendering service
1c) any one who aids another in any work
1c1) an assistant
1c2) of the preacher of the gospel
Part of Speech: noun masculine
Citing in TDNT: 8:530, 1231
From G5259 and a derivative of ἐρέσσω eressô (to row); an under oarsman, that is, (genitive case) subordinate (assistant, sexton, constable): - minister, officer, servant.
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 ὑπηρέτης; click on the second column to search for that grammatical form of the root ὑπηρέτης; click on the third column to search for that word and grammatical form; click on the total to search for the root ὑπηρέτης.