• To happen or take place.

    "The liftoff will occur in exactly twelve seconds."

  • (sciences) To be present or found.

    "The chemical monofluoroacetate occurs in all parts of Dichapetalum cymosum, and is responsible for its toxic effects."

  • (impersonal) To come or be presented to the mind; to suggest (itself).
  • To present or offer (itself).

    "I will write if the opportunity occurs."

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