emis·sion
n 1 : an act or instance of emitting 2 a : something sent forth by emitting: as (1) : electrons discharged from a surface (2) : electromagnetic waves radiated by an antenna or a celestial body (3) : substances and esp. pollutants discharged into the air (as by a smokestack or an automobile gasoline engine) b : a discharge of fluid from a living body : esp : EJACULATE - see NOCTURNAL EMISSION .
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