2) a title of honour, conferred on such as had done their country service, and upon princes, equivalent to Soter, Pater Patriae
Part of Speech: noun masculine
Citing in TDNT: 2:654, 251
From G2095 and the base of G2041; a worker of good, that is, (specifically) a philanthropist: - benefactor.
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 εὐεργέτης; click on the second column to search for that grammatical form of the root εὐεργέτης; click on the third column to search for that word and grammatical form; click on the total to search for the root εὐεργέτης.