1) it is lawful
Part of Speech: verb
Citing in TDNT: 2:560, 238
Third person singular present indicative of a compound of G1537 and G1510; so also ἐξόν exon; neuter present participle of the same (with or without some form of G1510 expressed); impersonally it is right (through the figurative idea of being out in public): - be lawful, let, X may (-est).
|a be possible||71.1|
|b ought to||71.32|
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 ἔξεστι; click on the second column to search for that grammatical form of the root ἔξεστι; click on the third column to search for that word and grammatical form; click on the total to search for the root ἔξεστι.