1) a fellow servant, one who serves the same master with another
1a) the associate of a servant (or slave)
1b) one who with others serves (ministers to) a king
1c) a colleague of one who is Christ's servant in publishing the gospel
1d) one who with others acknowledges the same Lord, Jesus, and obeys his commands
1e) one who with others is subject to the same divine authority in the Messianic economy
1e1) of angels as the fellow servants of Christians
Part of Speech: noun masculine
Citing in TDNT: 2:261, 182
From G4862 and G1401; a co-slave, that is, servitor or ministrant of the same master (human or divine): - fellowservant.
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 σύνδουλος; click on the second column to search for that grammatical form of the root σύνδουλος; click on the third column to search for that word and grammatical form; click on the total to search for the root σύνδουλος.