n A person or animal that acts as a substitute for the social or pastoral role of another, such as a surrogate mother.
n (US|_|legal): A judicial officer of limited jurisdiction, who administers matters of probate and intestate succession and, in some cases, adoptions.
n A surrogate or surrogate key is a unique identifier for either an entity in the modeled world or an object in the database.
n (computing) Any of a range of Unicode codepoints which are used in pairs in UTF-16 to represent characters beyond the Basic Multilingual Plane.