Definition of believe in
1
:to have faith or confidence in the existence of (something)
- Do you believe in ghosts?
2
:to have trust in the goodness or value of (something)
- She believes in (the value of) regular exercise.
- I believe in working hard to achieve success.
- She doesn't believe in using pesticides.
3
:to have trust in the goodness or ability of (someone)
- Despite his problems, his parents still believe in him.
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