"rotary" in the noun sense
1. traffic circle, circle, rotary, roundabout
a road junction at which traffic streams circularly around a central island
"the accident blocked all traffic at the rotary"
2. synchronous converter, rotary, rotary converter
electrical converter consisting of a synchronous machine that converts alternating to direct current or vice versa
"rotary" in the adjective sense
relating to or characterized by rotation
2. circular, rotary, orbitual
describing a circle moving in a circle
"the circular motion of the wheel"
Source: WordNet® (An amazing lexical database of English)
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