That is appointed to act on behalf of another person or group; delegated; commissioned. Frequently as postmodifier, esp. in judge delegate.

Of power, authority, etc.: that is of a delegated nature or type; (also) characterized by or involving delegation. Formerly also of a person…

Esp. of a person: appointed to act as deputy or representative for another. Also figurative.

= alleged, adj. (in various senses).