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Calque of the Latin use of crēdō (believe) with in plus accusative.


believe in (third-person singular simple present believes in, present participle believing in, simple past and past participle believed in)

  1. (transitive) To ascribe existence to.
    Do you believe in God? / the Easter Bunny? / ghosts?
    Since I don't believe in reincarnation, I believe that the only way to eliminate suffering is to die.
  2. (transitive) To believe that (something) is right or desirable.
    I don't believe in sex before marriage.
    I don't believe in making my bed.
    • 2017 June 23, "Is spokes model Cindy Margolis married or single after her divorce with Guy Starkman, Know her current affairs",[1]
      The couple is one of the celebrities who believed in open relationships.
  3. (transitive) To have confidence in the ability or power of.
    I believe in you, man! You can do it!