WordNet (r) 3.0 (2006):
oscitance n 1: drowsiness and dullness manifested by yawning [syn: oscitancy, oscitance] 2: an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom; "he could not suppress a yawn"; "the yawning in the audience told him it was time to stop"; "he apologized for his oscitancy" [syn: yawn, yawning, oscitance, oscitancy]