rotary
adjective
[ ˈrəʊt(ə)ri ]
• (of motion) revolving around a centre or axis; rotational.
rotary
noun
• a rotary machine, engine, or device.
• "there is an output level rotary for overall volume setting"
• a traffic roundabout.
Origin:
mid 18th century: from medieval Latin rotarius, from rota ‘wheel’.
