1) to mark off from others by boundaries, to limit, to separate
1a) in a bad sense: to exclude as disreputable
1b) in a good sense: to appoint, set apart for some purpose
Part of Speech: verb
Citing in TDNT: 5:454, 728
From G575 and G3724; to set off by boundary, that is, (figuratively) limit, exclude, appoint, etc.: - divide, separate, sever.
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 ἀφορίζω; click on the second column to search for that grammatical form of the root ἀφορίζω; click on the third column to search for that word and grammatical form; click on the total to search for the root ἀφορίζω.