One of the mysteries of the English language finally explained.
1The motion of bodies which are moving in parallel directions, of one body in a direction parallel to another, or of a body which points in the same direction at every point of the motion.
2A mechanical device which converts alternating rectilinear motion into circular motion, and vice versa.
3Music a movement of two parts or voices in the same direction, maintaining the same interval between them.
Early 18th century; earliest use found in Ephraim Chambers (?1680–1740), encyclopaedist.
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