Noah Webster's Dictionary 1. (a.) Very swift or quick; fast; as, a rapid stream; a rapid flight; a rapid motion. 2. (a.) Advancing with haste or speed; speedy in progression; in quick sequence; as, rapid growth; rapid improvement; rapid recurrence; rapid succession. 3. (a.) Quick in execution; as, a rapid penman. 4. (n.) 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.

Multi-Version Concordance Rapid (1 Occurrence) Ezra 5:8 Be it known to the king, that we went into the province of Judea, to the house of the great God, which is built with great stones, and timber is laid in the walls, and this work proceedeth rapidly, and prospereth in their hands. (Root in WBS NIV)