Webster's English Dictionary

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yawn

1. yawn \'yo.n, 'ya:n\ vb [ME yenen, yanen, fr. OE ginian; akin to OHG 
   gine-n]to yawn, L hiare, Gk chainein 1: to open wide GAPE  2: to open the 
   mouth wide usu. as an involuntary reaction to fatigue or bo redom : to 
   utter a yawn  - yawn.er n
2. yawn n 1: GAP, CAVITY  2: a deep usu. involuntary intake of breath 
   through the wide open mouth