[n., adj. sur-uh-geyt, -git, suhr-; v. sur-uh-geyt, suhr-]
a person appointed to act for another; deputy.
(in some states) a judicial officer having jurisdiction over the probate of wills, the administration of estates, etc.
the deputy of an ecclesiastical judge, especially of a bishop or a bishop's chancellor.
a substitute.
regarded or acting as a surrogate: a surrogate father.
involving or indicating the use of a surrogate mother to conceive or carry an embryo: surrogate parenting.
verb (used with object), surrogated, surrogating.
to put into the place of another as a successor, substitute, or deputy; substitute for another.
to subrogate.

1525–35; < Latin surrogātus, assimilated variant of subrogātus; see subrogate

surrogateship, noun
surrogation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  a person or thing acting as a substitute
2.  chiefly (Brit) a deputy, such as a clergyman appointed to deputize for a bishop in granting marriage licences
3.  psychiatry a person who is a substitute for someone else, esp in childhood when different persons, such as a brother or teacher, can act as substitutes for the parents
4.  (in some US states) a judge with jurisdiction over the probate of wills, etc
5.  (modifier) of, relating to, or acting as a surrogate: a surrogate pleasure
6.  to put in another's position as a deputy, substitute, etc
7.  to appoint as a successor to oneself
[C17: from Latin surrogāre to substitute; see subrogate]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1430, from L. surrogatus, pp. of surrogare "put in another's place, substitute," from sub "in the place of, under" + rogare "to ask, propose" (see rogation). Meaning "woman pregnant with the fertilized egg of another woman" is attested from 1978.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

surrogate sur·ro·gate (sûr'ə-gĭt, -gāt', sŭr'-)

  1. One that takes the place of another; a substitute.

  2. A person or an animal that functions as a substitute for another, as in a social or family role.

  3. A figure of authority who takes the place of the father or mother in a person's unconscious or emotional life.

  4. A surrogate mother.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Many people have kinda social surrogates, it is might be called as new social
  evolution in this time.
There may prove to be practical value to moon habitation, but beyond that,
  robots will have to be our surrogates.
In space, as in the deep oceans, human discoverers will yield to machine
Second, as surrogates the candidates for vice president help us to evaluate the
  presidential candidates.
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