'authorizer' originates from Late Latin, specifically the word 'authorizare,' where 'auctor' meant 'originator or promoter' and the suffix '-izare' meant 'to make or do.'

'authorizare' passed into Old French as 'autoriser' and then into Middle English as 'authorise/authorize'; the agent noun 'authorizer' was formed in English with the suffix '-er' to mean 'one who authorizes.'

Initially it carried the sense 'to make authoritative or grant authority,' and over time it evolved into the current sense 'to give official permission or approval.'