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rotary

[roh-tuh-ree] /ˈroʊ tə ri/
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, plural rotaries.
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.
Origin
1725-1735
1725-35; < Medieval Latin rotārius (adj.), equivalent to Latin rot(a) wheel + -ārius -ary
Related forms
unrotary, adjective

synchronous converter

noun, Electricity
1.
a synchronous machine for converting alternating current to direct current, or vice versa, in which the armature winding is connected to collector rings and to a commutator.
Also called rotary, rotary converter.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for rotary converter

rotary

/ˈrəʊtərɪ/
adjective
1.
of, relating to, or operating by rotation
2.
turning or able to turn; revolving
noun (pl) -ries
3.
a part of a machine that rotates about an axis
4.
(US & Canadian) a roundabout (for traffic)
Word Origin
C18: from Medieval Latin rotārius, from Latin rota a wheel

synchronous converter

noun
1.
a synchronous machine that converts alternating current to direct current, or vice versa
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for rotary converter

rotary

adj.

1731, from Medieval Latin rotarius "pertaining to wheels," from Latin rota "a wheel, a potter's wheel; wheel for torture," from PIE root *roto- "to run, to turn, to roll" (cf. Sanskrit rathah "car, chariot;" Avestan ratho; Lithuanian ratas "wheel," ritu "I roll;" Old High German rad, German Rad, Dutch rad, Old Frisian reth, Old Saxon rath, Old Irish 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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