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1. The unconscious triggering of a yawn by the sight, sound, or thought of a another person/animal yawning.

2. The phenomenon of contagious yawning.

Still a mystery to this day, scientists have yet to establish a concrete explanation of yawn contagiousness.
1. As Michael took notes during class, he noticed another student beginning to yawn, without thinking Michael began to yawn himself.

2. Erin: Hey Karl, have you ever wondered why seeing someone else yawn can sometimes make you yawn?
Karl: Yeah, no one really knows why it happens. It's a phenomeyawn.

by Karl Cruz March 14, 2008
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