serving to emit.
pertaining to emission.

1730–40; emiss(ion) + -ive

unemissive, adjective
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World English Dictionary
emission (ɪˈmɪʃən)
1.  the act of emitting or sending forth
2.  energy, in the form of heat, light, radio waves, etc, emitted from a source
3.  a substance, fluid, etc, that is emitted; discharge
4.  secondary emission See also thermionic emission a measure of the number of electrons emitted by a cathode or electron gun: at 1000°C the emission is 3 mA
5.  physiol any bodily discharge, esp an involuntary release of semen during sleep
6.  an issue, as of currency
[C17: from Latin ēmissiō, from ēmittere to send forth, emit]

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Example sentences
Triple-glazed, low-emissive windows will become common, accounting for up to a third of sales in colder climates.
The surface absorptive and emissive properties are different.
Note that for this emissive band the scattering is much weaker than for the reflective bands.
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