1. to give official permission or approval for something
Usage: British English spelling; American English uses 'authorize'
2. to give someone the power or right to do something
Usage: British English spelling; American English uses 'authorize'

Examples

• The manager authorised the purchase of new equipment.
• Only the director can authorise large expenses.
• The government authorised the construction of the new highway.
• She was authorised to make decisions on behalf of the company.
• The bank authorised the withdrawal from the account.
• Parliament authorised the new tax policy.