Meaning of “faith” - Learner’s Dictionary

faith

noun uk us /feɪθ/
TRUST [ U ]

B2 the belief that someone or something is good, right, and able to be trusted:

Have faith in me. I won't let you down.
STRONG BELIEF [ U ]

B2 strong belief in a god or gods:

Throughout her illness, she never lost her faith in God.
RELIGION [ C ]

B2 a religion:

the Jewish and Christian faiths
in good faith

If you act in good faith, you believe that what you are doing is good, honest, or legal:

Mr Daniels claims the money was given to him in good faith.

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