Surrogate

Noun

 * 1) A substitute (usually of a person, position or role).
 * 2) A person or animal that acts as a substitute for the social or pastoral role of another, such as a surrogate mother.
 * 3)  A deputy for a bishop in granting licences for marriage.
 * 4) 🇺🇸: A judicial officer of limited jurisdiction, who administers matters of probate and intestate succession and, in some cases, adoptions.
 * 5) A surrogate or surrogate key is a unique identifier for either an entity in the modeled world or an object in the database.
 * 6)  Any of a range of Unicode codepoints which are used in pairs in UTF-16 to represent characters beyond the Basic Multilingual Plane.

Adjective

 * Of, concerning, relating to or acting as a substitute.

Verb

 * 1)  To replace or substitute something with something else; appoint a successor.

Synonyms

 * deputize
 * foster
 * replace
 * subrogate
 * substitute

Thesaurus
advocate, agent, alter ego, alternate, alternative, amicus curiae, analogy, attorney, backup, backup man, champion, change, changeling, comparison, copy, counterfeit, deputy, double, dummy, equal, equivalent, ersatz, exchange, executive officer, exponent, fake, father figure, father image, figurehead, fill-in, ghost, ghostwriter, imitation, lieutenant, locum, locum tenens, makeshift, metaphor, metonymy, mother figure, mother surrogate, next best thing, paranymph, personnel, phony, pinch hitter, pleader, procurator, proxy, relief, replacement, representative, reserves, ringer, second in command, second string, secondary, sign, spares, stand-in, sub, substituent, substitute, substitution, succedaneum, superseder, supplanter, symbol, synecdoche, third string, token, understudy, utility man, utility player, vicar, vicar general, vice, vice-president, vice-regent, vicegerent