1) extremity, bound, end
1a) of a portion of space
1a3) the ends of the earth
1a4) the remotest lands
1b) of a thing extending through a period of time (termination)
Part of Speech: noun neuter
From the same as G4008; an extremity: - end, ut- (ter-) most part.
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 πέρας; click on the second column to search for that grammatical form of the root πέρας; click on the third column to search for that word and grammatical form; click on the total to search for the root πέρας.