Yawn

1. n. A chasm, mouth, or passageway.
2. v. i. To open the mouth involuntarily through drowsiness, dullness, or fatigue; to gape; to oscitate.
3. v. i. To open wide; to gape, as if to allow the entrance or exit of anything.
4. v. i. To open the mouth, or to gape, through surprise or bewilderment.
5. v. i. To be eager; to desire to swallow anything; to express desire by yawning; as, to yawn for fat livings.
6. 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.
7. n. The act of opening wide, or of gaping.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.