Origin: Latin suffix -ary
Rotary has 6 different meanings across 2 categories:
a road junction at which traffic streams circularly around a central island
"the accident blocked all traffic at the rotary"
electrical converter consisting of a synchronous machine that converts alternating to direct current or vice versa
"The old power plant relied on several rotary converters to transform alternating current into direct current before it reached the factory."
A traffic circle.
"Drivers must yield to pedestrians before entering the busy rotary on Main Street."
Capable of rotation.
The word rotary entered English in the mid-18th century from Medieval Latin rotarius, which originally meant "of a wheel." It derives directly from the Latin noun rota, signifying a wheel.