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rotary (adj.)

1731, from Medieval Latin rotarius "pertaining to wheels," from Latin rota "a wheel, a potter's wheel; wheel for torture," from PIE root *ret- "to run, to turn, to roll" (source also of Sanskrit rathah "car, chariot;" Avestan ratho; Lithuanian ratas "wheel," ritu "I roll;" Old Irish roth, Welsh rhod "carriage wheel"). The root also forms the common West Germanic word for "wheel" (originally "spoked wheel"): Old High German rad, German Rad, Dutch rad, Old Frisian reth, Old Saxon rath.

The international service club (founded by Paul P. Harris in Chicago in 1905) is so called from the practice of clubs entertaining in rotation. Hence Rotarian (1911).

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Definitions of rotary from WordNet
1
rotary (n.)
a road junction at which traffic streams circularly around a central island;
the accident blocked all traffic at the rotary
Synonyms: traffic circle / circle / roundabout
rotary (n.)
electrical converter consisting of a synchronous machine that converts alternating to direct current or vice versa;
Synonyms: synchronous converter / rotary converter
2
rotary (adj.)
relating to or characterized by rotation;
rotary dial
rotary (adj.)
describing a circle; moving in a circle;
Synonyms: circular / orbitual
From wordnet.princeton.edu