Anything rotary has a circular form, like an old-fashioned phone. A rotary is also a traffic circle.

Just as the Earth rotates around the sun, rotary objects move in a circle or orbit. A rotary telephone has a circular dial that turns, and a rotary mower has a cutting blade that moves in a circular motion. A type of street where traffic flows in a circle — sometimes called a roundabout — can also be called a rotary. The word stems from the Latin word rotarius, "pertaining to wheels," from its root word rota, or "wheel."

Definitions of rotary
  1. adjective
    describing a circle; moving in a circle
    synonyms: circular, orbitual
    cyclic, cyclical
    recurring in cycles
  2. adjective
    relating to or characterized by rotation
    rotary dial”
  3. noun
    a road junction at which traffic streams circularly around a central island
    “the accident blocked all traffic at the rotary
    synonyms: circle, roundabout, traffic circle
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    type of:
    the place where two or more things come together
  4. noun
    electrical converter consisting of a synchronous machine that converts alternating to direct current or vice versa
    synonyms: rotary converter, synchronous converter
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    type of:
    electrical converter
    converter that converts alternating current into direct current or vice versa
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