Nouns

(n)sanction, countenance, endorsement, indorsement, warrant, imprimaturformal and explicit approval“a Democrat usually gets the union's endorsement”
(n)sanctiona mechanism of social control for enforcing a society's standards
(n)authority, authorization, authorisation, sanctionofficial permission or approval“authority for the program was renewed several times”
(n)sanctionthe act of final authorization“it had the sanction of the church”

Verbs

(v)approve, O.K., okay, sanctiongive sanction to“I approve of his educational policies”
(v)sanctiongive authority or permission to
(v)sanction, sanctifygive religious sanction to, such as through an oath“sanctify the marriage”