1. official permission or approval to do something
2. a document or certificate that gives official permission

Examples

• You need authorization from your supervisor before making that purchase.
• The security guard asked to see my authorization to enter the building.
• Congressional authorization is required for military action.
• She received written authorization to access the confidential files.
• The bank requires authorization for all large transactions.
• Without proper authorization, the project cannot proceed.
• The authorization expires at the end of the month.