Origin: 1400–50; late ME < L
permissiōn- (s. of
permissiō) a yielding, giving leave, equiv. to
permiss(
us) (ptp. of
permittere to
permit ) +
-iōn- -ion 
Related forms: per⋅mis⋅sioned, adjective
Synonyms:
1. leave, sanction.
Antonyms:
1. restraint, refusal.