(1):
(n.) To exercise belief in; to credit upon the authority or testimony of another; to be persuaded of the truth of, upon evidence furnished by reasons, arguments, and deductions of the mind, or by circumstances other than personal knowledge; to regard or accept as true; to place confidence in; to think; to consider; as, to believe a person, a statement, or a doctrine.
(2):
(v. i.) To think; to suppose.
(3):
(v. i.) To have a firm persuasion, esp. of the truths of religion; to have a persuasion approaching to certainty; to exercise belief or faith.