Jisho

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Noun
1. medium (for carrying energy waves); transmission mediumPhysics
Wikipedia definition
2. Transmission mediumA transmission medium (plural transmission media) is a material substance that can propagate energy waves. For example, the transmission medium for sound received by the ears is usually air, but solids and liquids may also act as transmission media for sound. The absence of a material medium in vacuum may also constitute a transmission medium for electromagnetic waves such as light and radio waves.
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