foster - definition in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online (US)

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foster

verb uk   /ˈfɒs.tər/  us   /ˈfɑː.stɚ/

foster verb (TAKE CARE OF)

[I or T] to take care of a child, usually for a limited time, without being the child's legal parent: Would you consider fostering (a child)?
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foster verb (ENCOURAGE)

[T] to encourage the development or growth of ideas or feelings: I'm trying to foster an interest in classical music in my children. They were discussing the best way to foster democracy and prosperity in the former communist countries.

foster

adjective [before noun] uk   /ˈfɒs.tər/  us   /ˈfɑː.stɚ/
used to refer to someone or something connected with the care of children, usually for a limited time, by someone who is not the child's legal parent: a foster care/home/child/mother She was taken into care by the local council and placed with a foster family. As a child, he had lived with a succession of foster parents.
(Definition of foster from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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