Meaning of “foster” in the English Dictionary

"foster" in English

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uk /ˈfɒs.tər/ us /ˈfɑː.stɚ/

fosteradjective [ 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:

The neglected child was removed from her home and placed with a foster family.
As a child, he had lived with a series of foster parents.
her foster father/mother

(Definition of “foster” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"foster" in American English

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fosterverb [ T ]

us /ˈfɔs·tər, ˈfɑs-/

foster verb [ T ] (TAKE CARE OF)

to take care of a child as if it were your own, usually for a limited time, without being the child’s legal parent

foster verb [ T ] (ENCOURAGE)

to encourage the development or growth of ideas or feelings:

I try to foster an appreciation for classical music in my students.

fosteradjective [ not gradable ]

us /ˈfɔs·tər, ˈfɑs-/

providing a home or care to a child when you are not their legal parent, or receiving such care, usually for a limited time:

A social service agency placed the child with a foster family.

(Definition of “foster” from the Cambridge Academic Content Dictionary © Cambridge University Press)