Longman Dictionary of Contemporary English homepage

emission

 noun
     
e‧mis‧sion
1 [countable usually plural]TIF a gas or other substance that is sent into the air:
Britain agreed to cut emissions of nitrogen oxide from power stations.
2 [uncountable] the act of sending out light, heat, gas etc
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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