1. (v. i.) To open the mouth involuntarily through drowsiness, dullness, or fatigue; to gape; to oscitate.

2. (v. i.) To open wide; to gape, as if to allow the entrance or exit of anything.

3. (v. i.) To open the mouth, or to gape, through surprise or bewilderment.

4. (v. i.) To be eager; to desire to swallow anything; to express desire by yawning; as, to yawn for fat livings.

5. (n.) An involuntary act, excited by drowsiness, etc., consisting of a deep and long inspiration following several successive attempts at inspiration, the mouth, fauces, etc., being wide open.

6. (n.) The act of opening wide, or of gaping.

7. (n.) A chasm, mouth, or passageway.

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