per·mis·sion 
(pər-mĭshən)
(pər-mĭshən)n.
1. The act of permitting, especially in giving formal consent; authorization: Do they have permission to leave?
2. An authorization to do something, as to quote from a book under copyright.
[Middle English, from Old French, from Latin permissiō, permissiōn-, from permissus, past participle of permittere, to permit; see PERMIT1.]
Synonyms: permission, authorization, consent, leave2, license, sanction
These nouns denote approval for a course of action that an authority has granted: was refused permission to smoke; seeking authorization to begin construction; gave their consent to the marriage; will ask leave to respond to the speaker; was given license to depart; gave sanction to the project.
These nouns denote approval for a course of action that an authority has granted: was refused permission to smoke; seeking authorization to begin construction; gave their consent to the marriage; will ask leave to respond to the speaker; was given license to depart; gave sanction to the project.
Antonym: prohibition