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English definition of “surrogate”

surrogate

adjective [before noun] uk   /ˈsʌr.ə.ɡət/ us    /ˈsɝː-/
replacing someone else or used instead of something else: Because she had no children of her own, her friend's son became a kind of surrogate child to her.

surrogate

noun uk   /ˈsʌr.ə.ɡət/ us    /ˈsɝː-/
[C] something that replaces or is used instead of something else: For some people, reading travel books is a surrogate for actual travel. (also surrogate mother) a woman who has a baby for another person who is unable to become pregnant or have a baby: She has agreed to act as a surrogate mother for her sister.
(Definition of surrogate from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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