Definitions of yawn:

  • noun:   an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom
    Example: "He could not suppress a yawn"
  • verb:   utter a yawn, as from lack of oxygen or when one is tired
    Example: "The child yawned during the long performance"
  • verb:   be wide open
  • name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #13368)