ro·ta·ry

[roh-tuh-ree] adjective, noun, plural ro·ta·ries.
adjective
1.
turning or capable of turning around on an axis, as a wheel.
2.
taking place around an axis, as motion.
3.
having a part or parts that turn on an axis, as a machine.
noun
4.
a rotary device or machine.
5.
Chiefly Northeastern U.S. traffic circle.
6.
Also called rotary converter. Electricity, synchronous converter.
7.
( initial capital letter ) Rotary Club.
00:10
Rotary is always a great word to know.
So is flibbertigibbet. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a chattering or flighty, light-headed person.

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

un·ro·ta·ry, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
rotary (ˈrəʊtərɪ) [Click for IPA pronunciation guide]
 
adj
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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Etymonline
Word Origin & History

rotary
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
Then you have the steam rotary engine that will run mainly on water for steam
  and fuel.
Two gilt bud vases, perpetually bursting with dried violets, partially
  concealed an old rotary phone.
Pick a windless day and sow seed evenly, using a drop or rotary spreader.
They rush forwards, waving and yelling soundlessly against the roar of rotary
  blades.
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