'authorize' definitions:

Definition of 'authorize'

From: WordNet
verb
Grant authorization or clearance for; "Clear the manuscript for publication"; "The rock star never authorized this slanderous biography" [syn: authorize, authorise, pass, clear]
verb
Give or delegate power or authority to; "She authorized her assistant to sign the papers" [syn: empower, authorise, authorize]

Synonyms of 'authorize'

From: Moby Thesaurus