Etymology
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authorise (v.)

chiefly British English spelling of authorize (q.v.); for suffix, see -ize. Related: Authorised; authorising; authorisation.

updated on August 30, 2017

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Definitions of authorise from WordNet

authorise (v.)
give or delegate power or authority to;
Synonyms: empower / authorize
authorise (v.)
grant authorization or clearance for;
Synonyms: authorize / pass / clear
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.