rotary (Adjective) — Relating to or characterized by rotation. ex. "rotary dial"
rotary (Adjective) — Describing a circle; moving in a circle. ex. "the rotary motion of the wheel"
rotary (Noun) — A road junction at which traffic streams circularly around a central island. ex. "the accident blocked all traffic at the rotary"
rotary (Noun) — Electrical converter consisting of a synchronous machine that converts alternating to direct current or vice versa.