/ ˈrəʊtəri; NAmE ˈroʊ-/ adjective , noun
■ adjective [ only before noun ]
1.
( of a movement ) moving in a circle around a central fixed point :
rotary motion
2.
( of a machine or piece of equipment ) having parts that move in this way :
a rotary engine
■ noun
( pl. -ies ) ( NAmE ) = roundabout
••
WORD ORIGIN
mid 18th cent.: from medieval Latin rotarius , from rota wheel.