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e·mis·sion  (-mshn)
1. The act or an instance of emitting.
2. Something emitted.
3. A substance discharged into the air, especially by an internal combustion engine.

[Latin missi, missin-, a sending out, from missus, past participle of mittere, to send out; see emit.]

emission  /mn/  n. [C;U] s.t. that is sent out, (syn.) a discharge: Automobiles and trucks produce emissions that pollute the air. emission

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