WordReference Random House Learner's Dictionary of American English © 2019
reg•u•la•tion /ˌrɛgyəˈleɪʃən/USA pronunciation   n. 
  1. [countable] a law, rule, or other order given by authority, esp. to regulate conduct.
  2. the act of regulating or the state of being regulated:[uncountable]strict regulation of the number of cars entering the country.

adj. [usually: before a noun]
  1. ordered by or agreeing with regulation:regulation army equipment.
See -reg-.
WordReference Random House Unabridged Dictionary of American English © 2019
reg•u•la•tion  (reg′yə lāshən),USA pronunciation n. 
  1. a law, rule, or other order prescribed by authority, esp. to regulate conduct.
  2. the act of regulating or the state of being regulated.
  3. Mechanical Engineering[Mach.]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.
  4. Electronicsthe 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.
  5. Sportthe 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.

  1. prescribed by or conforming to regulation:regulation army equipment.
  2. usual;
    customary:the regulation decorations for a Halloween party.
  • regulate + -ion 1665–75
    • 2.See corresponding entry in Unabridged direction, management, control, disposition, adjustment.

Collins Concise English Dictionary © HarperCollins Publishers::

regulation /ˌrɛɡjʊˈleɪʃən/ n
  1. the act or process of regulating
  2. a rule, principle, or condition that governs procedure or behaviour
  3. (modifier) as required by official rules or procedure: regulation uniform
  4. (modifier) normal; usual; conforming to accepted standards: a regulation haircut

'regulation' also found in these entries:
Collocations: [at, near] the end of regulation time, regulation [army, marine] equipment, dressed in regulation uniform, more...

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