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emission

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noun emission pronunciation in British English /ɪˈmɪʃ(ə)n/ 
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singularemission
pluralemissions
  1. [countable] a substance, especially a gas, that goes into the air

    New regulations are aimed at reducing vehicle emissions.

    emission from:

    Emissions from power stations have declined since 1979.

    1. a.
      [uncountable] the act of sending gas, light, or heat into the air
      emission of:

      the emission of greenhouse gases

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