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Rapid (a.) Very swift or quick; moving with celerity; fast; as, a rapid stream; a rapid flight; a rapid motion.
Rapid (a.) Advancing with haste or speed; speedy in progression; in quick sequence; as, rapid growth; rapid improvement; rapid recurrence; rapid succession.
Rapid (a.) Quick in execution; as, a rapid penman.
Rapid (a.) The part of a river where the current moves with great swiftness, but without actual waterfall or cascade; -- usually in the plural; as, the Lachine rapids in the St. Lawrence.