believe Definition in the Cambridge English Dictionary
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Definition of “believe” - English Dictionary

Definition of "believe" - American English Dictionary

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believeverb [I/T]

 us   /bɪˈliv/
to ​think that something is ​true or ​correct: [T] One ​juror said he didn’t believe the policeman’s ​testimony. [+ (that) clause] She believed (that) it was ​wrong to ​censor the ​text. If you believe in something, you ​feel that it is ​right: [I always + adv/prep] I believe in giving a ​person a second ​chance. If you believe in someone you have ​confidence in that person's ​abilities: [I always + adv/prep] We just need to believe in ourselves.
(Definition of believe from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "believe" - British English Dictionary

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believeverb [T]

uk   us   /bɪˈliːv/
A2 to ​think that something is ​true, ​correct, or ​real: Strangely, no one believed us when we told them we'd been ​visited by a ​creature from ​Mars. [+ that] He believes that all ​children are ​born with ​equalintelligence. She's ​arrivingtomorrow, I believe. "Is she coming ​alone?" "We believe not/so (= we ​think she is not/is)." [+ obj + to infinitive ] I believe her to be the ​finestviolinist in the ​world. [+ obj + adj ] All the ​crew are ​missing, believed ​dead.not believe a word of it to not believe that something is ​true: He told me she was just a ​friend, but I don't believe a word of it!believe it or not B1 (also would you believe it?) said when ​telling someone about something that is ​true, ​although it ​seemsunlikely: He's ​upstairs doing his ​homework, believe it or not.believe me said when ​emphasizing that something is ​true: Believe me, I was ​scared !if you believe that, you'll believe anything! informal something that you say to ​emphasize that something is ​obviously not ​true: He said the ​car in ​frontbacked into him, and if you believe that, you'll believe anything!make believe to ​pretend or ​imagine: Let's make believe (that) we're ​pirates.
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(Definition of believe from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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