a law, rule, or other order prescribed by authority, especially to regulate conduct.
the act of regulating or the state of being regulated.
Machinery. the percentage difference in some quantity related to the operation of an apparatus or machine, as the voltage output of a transformer or the speed of a motor, between the value of the quantity at no-load operation and its value at full-load operation.
Electronics. the difference between maximum and minimum voltage drops between the anode and the cathode of a gas tube for a specified range of values of the anode current.
Sports. the normal, prescribed duration of a game according to the sport's regulations, exclusive of any extra innings, overtime period, etc.: The Knicks tied the score in the final seconds of regulation, sending the game into overtime.
prescribed by or conforming to regulation: regulation army equipment.
usual; normal; customary: the regulation decorations for a Halloween party.

1665–75; regulate + -ion

nonregulation, noun
overregulation, noun
reregulation, noun
superregulation, noun

2. direction, management, control, disposition, adjustment. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
regulation (ˌrɛɡjʊˈleɪʃən)
1.  the act or process of regulating
2.  a rule, principle, or condition that governs procedure or behaviour
3.  a governmental or ministerial order having the force of law
4.  embryol the ability of an animal embryo to develop normally after its structure has been altered or damaged in some way
5.  (modifier) as required by official rules or procedure: regulation uniform
6.  (modifier) normal; usual; conforming to accepted standards: a regulation haircut
7.  electrical engineering the change in voltage occurring when a load is connected across a power supply, caused by internal resistance (for direct current) or internal impedance (alternating current)

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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American Heritage
Medical Dictionary

regulation reg·u·la·tion (rěg'yə-lā'shən)

  1. The act of regulating or the state of being regulated.

  2. A principle, rule, or law designed to control or govern conduct.

  3. A governmental order having the force of law.

  4. The capacity of an embryo to continue normal development following injury to or alteration of a structure.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Cultural Dictionary

regulation definition

Laws through which governments can control privately owned businesses.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Consumer advocates say regulation of the credit card industry has long been
  without teeth.
So it's public regulation to constrain private regulation.
Range feeding sounds easy, but this may require a bit of regulation.
Calls for regulation might sound wimpy in the face of climate-change risks.
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