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A substitute (usually of a person, position or role).
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A person or animal that acts as a substitute for the social or pastoral role of another, such as a surrogate parent.
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(chiefly British) A deputy for a bishop in granting licences for marriage.
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(US, politics) A politician or person of influence campaigning for a presidential candidate.
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(US law) A judicial officer of limited jurisdiction, who administers matters of probate and intestate succession and, in some cases, adoptions.
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(computing) Any of a range of Unicode codepoints which are used in pairs in UTF-16 to represent characters beyond the Basic Multilingual Plane.
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(economics) An ersatz good.
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(databases) Ellipsis of surrogate key.