c.1320, "a turn, a shift on duty," from O.Fr. tour, tourn "a turn, trick, round, circuit, circumference," from torner, tourner "to turn," from L. tornare "to polish, round off, fashion, turn on a lathe" (see turn
). Sense of "a traveling around, journey" is first recorded 1643.
The verb is attested from 1746. Tour de force "feat of strength" is 1802, from Fr., from force "strength." Tour de France is recorded from 1922. The Grand Tour, a journey through France, Germany, Switzerland, and Italy formerly was the finishing touch in the education of a gentleman.