A person authorized to act as representative for another; a deputy
A representative at a conference, etc.
An appointed representative in some legislative bodies
A type of variable storing a reference to a method with a particular signature, analogous to a function pointer
To authorize someone to be a delegate
To commit a task to someone, especially a subordinate
(of a subdomain) to give away authority over a subdomain; to allow someone else to create sub-subdomains of a subdomain of one's own