Able to emit or give off energy, light, or particles; relating to or characterized by emission.
From Latin emittere (to send out) plus the suffix -ive (meaning inclined to or characterized by), following standard English adjective-forming patterns.
In physics, 'emissive' is a key term—an object's emissivity determines how much heat radiation it releases, which is why black bodies are more emissive than shiny ones, explaining why a dark car heats up faster in the sun.
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