In phase together; describing signals, waves, or oscillations that have the same phase or frequency and vibrate in synchronization.
From 'co-' (together) + 'phasal' (relating to phase, from Greek 'phasis,' appearance or stage). A technical term used in physics, engineering, and signal processing.
Cophasal waves are why stereos have 'phase coherence'—when speakers emit cophasal sound waves, they reinforce each other and sound louder and clearer, but if they're out of phase, they cancel out and sound terrible, which is why speaker placement matters.
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