oscitancy

Words with a similar base: oscitancy

'oscitancy'

[oscitancy.n.01] as in: drowsiness and dullness manifested by yawning

'oscitancy'

[yawn.n.01] as in: an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom

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Examples:
he could not suppress a yawn
the yawning in the audience told him it was time to stop
he apologized for his oscitancy