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From Biology-Online Dictionary | Biology-Online Dictionary
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1. To clothe with authority, warrant, or legal power; to give a right to act; to empower; as, to authorise commissioners to settle a boundary.

2. To make legal; to give legal sanction to; to legalize; as, to authorise a marriage.

3. To establish by authority, as by usage or public opinion; to sanction; as, idioms authorised by usage.

4. To sanction or confirm by the authority of some one; to warrant; as, to authorise a report. A woman's story at a winters fire, Authorised by her grandam. (Shak)

5. To justify; to furnish a ground for.

Origin: oe. Autorize, f. Autoriser, fr. LL. Auctorizare, authorisare. See Author.