Of a person: endowed with the authority to act on a superior's behalf; permitted to act as a deputy. Frequently as postmodifier. Now historical…

(participle and adj.) Deputed; appointed, assigned.

Acting as a deputy; deputed.

That consists of people chosen (typically by election) to speak and act on behalf of a wider group.

That is a surrogate; taking the place of or standing for something else; representative. Now esp. in contexts where the substitute is intended to…

Characterized by deputation or by being deputed; of the nature of a deputy.

Of, belonging, or relating to an agent or agency (in various senses of the nouns); that is or acts as an agent.

Of an organization: that acts as a representative for a product, a company, etc.