Meaning of “foster” - Learner’s Dictionary

foster

verb [ T ] uk us /ˈfɒstər/
ENCOURAGE

to encourage a particular feeling, situation, or idea to develop:

The growth of the Internet could foster economic development worldwide.
CHILD

to look after a child as part of your family for a time, without becoming their legal parent

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