'Rotation'

Rotary can refer to:

• Rotary dial, a rotating telephone dial
• Rotary engine, a type of internal combustion engine from the early 20th century
• Rotary International, a service organization
• Rotary milking shed, a type of milking shed used in the Dairy industry
• Rotary system, a type of pre-electronic Telephone switch for Central offices
• Rotary table (drilling rig), a device used to apply directional force to a drill string.
• Rotary tiller, a motorised cultivator
• Rotary Watches, a Swiss watchmaker
• Rotary Woofer, a type of loudspeaker capable of producing very low frequency sound
• Rotary Wing Aircraft (Rotocraft)
• Traffic circle, a type of Roundabout or road junction at which traffic streams around a central island
• Wankel engine, Rotary engine is another commonly used name for the Wankel engine.