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Definition of sure
sure - adj. physically secure or dependable; certain not to fail; infallible or unfailing; (of persons) worthy of trust or confidence; exercising or taking care great enough to bring assurance; impossible to doubt or dispute; having or feeling no doubt or uncertainty; confident and assured; certain to occur; destined or inevitable; reliable in operation or effect; adv. definitely or positively (`sure' is sometimes used informally for `surely').
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