Longman Dictionary of Contemporary English homepage

Topic: ENGINEERING

Date: 1700-1800
Language: Medieval Latin
Origin: rotarius, from Latin rota; ROTATE

rotary

1 adjective
     
ro‧ta‧ry1 [only before noun]
1 turning in a circle around a fixed point, like a wheel:
the rotary movement of the helicopter blades
2TE having a main part that turns like a wheel:
a rotary engine
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