turning or capable of turning around on an axis, as a wheel.
taking place around an axis, as motion.
having a part or parts that turn on an axis, as a machine.
noun, plural rotaries.
a rotary device or machine.
Chiefly Northeastern U.S. traffic circle.
Also called rotary converter. Electricity, synchronous converter.
(initial capital letter) Rotary Club.

1725–35; < Medieval Latin rotārius (adj.), equivalent to Latin rot(a) wheel + -ārius -ary

unrotary, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rotary (ˈrəʊtərɪ)
1.  of, relating to, or operating by rotation
2.  turning or able to turn; revolving
n , -ries
3.  a part of a machine that rotates about an axis
4.  (US), (Canadian) a roundabout (for traffic)
[C18: from Medieval Latin rotārius, from Latin rota a wheel]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1731, from M.L. rotarius "pertaining to wheels," from L. rota "wheel," from PIE base *roto- "to run, to turn, to roll" (cf. Skt. rathah "car, chariot;" Avestan ratho; Lith. ratas "wheel," ritu "I roll;" O.H.G. rad, Ger. Rad, Du. rad, O.Fris. reth, O.S. rath, O.Ir. roth, Welsh rhod "carriage wheel").
The international service club (founded by Paul P. Harris in Chicago in 1905) so called from the practice of clubs entertaining in rotation. Hence Rotarian (1911).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Pick a windless day and sow seed evenly, using a drop or rotary spreader.
Rotary mowers and weed eaters are other good choices for weed control in larger
It uses a rotary device which in turn rotates a propeller to move.
Two gilt bud vases, perpetually bursting with dried violets, partially
  concealed an old rotary phone.
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