—v.i. to have confidence in the truth, the existence, or the reliability of something, although without absolute proof that one is right in doing so: Only if one believes in something can one act purposefully.
—v.t. 1. to have confidence or faith in the truth of (a positive assertion, story, etc.); give credence to.
2. to have confidence in the assertions of (a person).
3. to have a conviction that (a person or thing) is, has been, or will be engaged in a given action or involved in a given situation: The fugitive is believed to be headed for the Mexican border. 4. to suppose or assume; understand (usually fol. by a noun clause): I believe that he has left town. 5. believe in, a. to be persuaded of the truth or existence of: to believe in Zoroastrianism; to believe in ghosts. b. to have faith in the reliability, honesty, benevolence, etc., of: I can help only if you believe in me. 6. make believe. See make (def. 46).