verb (used with object), regulated, regulating.
to control or direct by a rule, principle, method, etc.: to regulate household expenses.
to adjust to some standard or requirement, as amount, degree, etc.: to regulate the temperature.
to adjust so as to ensure accuracy of operation: to regulate a watch.
to put in good order: to regulate the digestion.

1620–30; < Late Latin rēgulātus (past participle of rēgulāre). See regula, -ate1

regulative [reg-yuh-ley-tiv, -yuh-luh-tiv] , regulatory [reg-yuh-luh-tawr-ee, -tohr-ee] , adjective
regulatively, adverb
antiregulatory, adjective
misregulate, verb (used with object), misregulated, misregulating.
nonregulated, adjective
nonregulative, adjective
nonregulatory, adjective
overregulate, verb, overregulated, overregulating.
preregulate, verb (used with object), preregulated, preregulating.
quasi-regulated, adjective
reregulate, verb (used with object), reregulated, reregulating.
unregulated, adjective
unregulative, adjective
unregulatory, adjective
well-regulated, adjective

1. rule, govern, manage, order, adjust, arrange, dispose, conduct. 2. set. 4. systematize. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
regulate (ˈrɛɡjʊˌleɪt)
1.  to adjust (the amount of heat, sound, etc, of something) as required; control
2.  to adjust (an instrument or appliance) so that it operates correctly
3.  to bring into conformity with a rule, principle, or usage
[C17: from Late Latin rēgulāre to control, from Latin rēgula a ruler]

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

c.1630, from L.L. regulatus, pp. of regulare "to control by rule, direct" (5c.), from L. regula "rule" (see regular). Regulation is first recorded 1672, "act of regulating;" sense of "rule for management" is first attested 1715. Regulator is first recorded 1655; in Eng.
history, with a capital R-, "member of a commission appointed in 1687 to manage county elections." In U.S. history, applied to local posses that kept order (or disturbed it) in rural regions c.1767-71. Meaning "clock by which other timepieces are set" is attested from 1758.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

regulate reg·u·late (rěg'yə-lāt')
v. reg·u·lat·ed, reg·u·lat·ing, reg·u·lates

  1. To control or direct according to rule, principle, or law.

  2. To adjust to a particular specification or requirement.

  3. To adjust a mechanism for accurate and proper functioning.

  4. To put or maintain in order.

reg'u·la'tive or reg'u·la·to'ry (-lə-tôr'ē) adj.
reg'u·la'tor n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
No, the kidneys help regulate blood pressure through hormonal means which
  manage salt and water balance in the blood.
There is likely to be an even bigger fight over the proposal to regulate
  financial derivative products.
It can regulate the amount of nicotine, and how it is marketed, but that is all.
The business cycle should not affect the choice to regulate.
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