Definition of emission
2a
: something sent forth by emitting: such as
(1)
: electromagnetic radiation from an antenna or a celestial body
(2)
usually emissions
: substances discharged into the air (as by a smokestack or an automobile engine)
b
: effluvium
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Merriam-Webster unabridged
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Time Traveler for emission
The first known use of emission was in 1607
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