verb (used without object), circulated, circulating.
to move in a circle or circuit; move or pass through a circuit back to the starting point: Blood circulates throughout the body.
to pass from place to place, from person to person, etc.: She circulated among her guests.
to be distributed or sold, especially over a wide area.
Library Science. (of books and other materials) to be available for borrowing by patrons of a library for a specified period of time.
verb (used with object), circulated, circulating.
to cause to pass from place to place, person to person, etc.; disseminate; distribute: to circulate a rumor.
Library Science. to lend (books and other materials) to patrons of a library for a specified period of time.

1425–75 for earlier senses; 1665–75 for current senses; late Middle English < Latin circulātus (past participle of circulārī to gather round one, Medieval Latin circulāre to encircle), equivalent to circul(us) circle + -ātus -ate1

circulatable, adjective
circulative [sur-kyuh-ley-tiv, -luh-tiv] , adjective
circulatory [sur-kyuh-luh-tawr-ee, -tohr-ee] , adjective
intercirculate, verb, intercirculated, intercirculating.
noncirculating, adjective
noncirculatory, adjective
precirculate, verb, precirculated, precirculating.
recirculate, verb, recirculated, recirculating.
uncirculated, adjective
uncirculating, adjective
uncirculative, adjective
well-circulated, adjective

3. disperse, spread, promulgate. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
circulate (ˈsɜːkjʊˌleɪt)
1.  to send, go, or pass from place to place or person to person: don't circulate the news
2.  to distribute or be distributed over a wide area
3.  to move or cause to move through a circuit, system, etc, returning to the starting point: blood circulates through the body
4.  to move in a circle: the earth circulates around the sun
[C15: from Latin circulārī to assemble in a circle, from circuluscircle]

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

1471, as a chemical term for alternating vaporization and condensation, from L. circulatus, pp. of circulare, from circulus (see circle). Meaning "to move around, revolve" is from 1670s; of blood, from 1656; of persons, "to mingle in a social gathering," from 1863. Sense
of "to pass about freely" is from 1664; of newspapers from 1885. Related: Circulating (1630s).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
circulate   (sûr'kyə-lāt')  Pronunciation Key 
To move in or flow through a circle or a circuit. Blood circulates through the body as it flows out from the heart to the tissues and back again.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The rating will give you some idea of the unit's ability to circulate air.
Each year throngs of scientists circulate through the world's coral reefs,
  leaving reams of data in their wake.
These proteins continue to circulate in the bloodstream and can recognize new
  invaders that resemble past pathogens.
Nothing is new under the sun, but sometimes the word is slow to circulate.
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