1) exceeding some number or measure or rank or need
1a) over and above, more than is necessary, superadded
1a1) exceeding abundantly, supremely
1a2) something further, more, much more than all, more plainly
1b) superior, extraordinary, surpassing, uncommon
1b1) pre-eminence, superiority, advantage, more eminent, more remarkable, more excellent
Part of Speech: comparative
Comparative of G4053; more superabundant (in number, degree or character): - more abundant, greater (much) more, overmuch.
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 περισσότερον; click on the second column to search for that grammatical form of the root περισσότερον; click on the third column to search for that word and grammatical form; click on the total to search for the root περισσότερον.