Authorises is a term that refers to granting permission or approval for something. There are several synonyms for authorises, which include empower, permit, sanction, endorse, accredit, license, certify, ratify, validate, and mandate. Empower means to give someone the ability or authority to do something. Permit means to allow or give consent for something to happen. Sanction refers to the act of officially approving or endorsing something. Endorse means to express support or approval for something. Accredit refers to the process of officially recognizing and approving someone or something. License refers to the granting of permission to use or do something. Certify means to confirm or attest to the truthfulness or accuracy of something. Ratify means to officially approve or confirm something. Validate means to confirm or verify the accuracy or completeness of something. Mandate refers to authorizing or commanding someone to do something.