Princeton's WordNet

1. yawn, yawning, oscitance, oscitancy(adj)

   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"

2. yawning(adj)

   gaping open as if threatening to engulf someone or something

   "the yawning mine shaft"; "a yawning abyss"

3. yawning(adj)

   with the mouth wide open indicating boredom or sleepiness

   "a yawning congregation"

4. drowsy, oscitant, yawning(a)(adj)

   showing lack of attention or boredom

   "the yawning congregation"

Wiktionary

1. yawning(Noun)

   The action of the verb yawn.

2. yawning(Adjective)

   That yawns or yawn.

   yawning commuters

3. yawning(Adjective)

   Wide open.

   a yawning chasm

Webster Dictionary

1. Yawning(u)

   of Yawn

U.S. National Library of Medicine

1. Yawning

   An involuntary deep INHALATION with the MOUTH open, often accompanied by the act of stretching.

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