1. to give official permission or approval for something
Usage: British English spelling; American English uses 'authorizes'; third person singular present tense
2. to give someone the power or right to do something
Usage: British English spelling; American English uses 'authorizes'; third person singular present tense

Examples

• The manager authorises all expenses over £500.
• The government authorises the use of new medications after rigorous testing.
• Only the director can authorise changes to the project budget.
• The contract authorises the company to operate in three countries.
• She authorises her assistant to sign documents on her behalf.
• The law authorises police to conduct searches with a warrant.