Learner's definition of FAITH
1 [noncount] : strong belief or trust in someone or something
His supporters have accepted his claims with blind/unquestioning faith.
Our faith in the government has been badly shaken by the recent scandals.
His parents have always had faith in him. = His parents have never lost faith in him. [=his parents have always believed that he is a person who deserves to be trusted and who will succeed]
I have no faith in politicians. = I put/have little faith in politicians. [=I do not trust politicians]
Lending him the money to start his own business was an act of faith.
It requires a giant leap of faith for us to believe that she is telling the truth.
2 a [noncount] : belief in the existence of God : strong religious feelings or beliefs
b [count] : a system of religious beliefs : religion
Nothing is more important to her than her faith in God.
She says that her faith has given her the courage to deal with this tragedy.
He says he has found faith. [=he has begun to believe in God or has developed strong religious beliefs]
accept/take (something) on faith
: to accept (something) as true without proof or evidence that it is true
an article of faith
: something that is believed without being questioned or doubted
break faith with
: to stop supporting or being loyal to (someone) : to betray (someone)
keep faith with
: to continue supporting or being loyal to (someone)
keep the faith
: to continue to believe in, trust, or support someone or something when it is difficult to do so