Definition of oscitation in US English:

oscitation

noun

rare
  • The action or an act of yawning from drowsiness.

Origin

Mid 16th century; earliest use found in Andrew Borde (c1490–1549), physician and author. From classical Latin ōscitātiōn-, ōscitātiō the action of yawning from ōscitāt-, past participial stem of ōscitāre and ōscitārī + -iō.

Pronunciation

oscitation

/ˌɒsɪˈteɪʃn/