The Collaborative International Dictionary of English v.0.48:
Yawn \Yawn\ (y[add]n), v. i. [imp. & p. p. Yawned; p. pr. &
vb. n. Yawning.] [OE. yanien, [yogh]anien, ganien, gonien,
AS. g[=a]nian; akin to ginian to yawn, g[imac]nan to yawn,
open wide, G. g[aum]hnen to yawn, OHG. gin[=e]n, gein[=o]n,
Icel. g[imac]na to yawn, gin the mouth, OSlav. zijati to
yawn, L. hiare to gape, yawn; and perhaps to E. begin, cf.
Gr. cheia` a hole. [root]47b. Cf. Begin, Gin to begin,
1. To open the mouth involuntarily through drowsiness,
dullness, or fatigue; to gape; to oscitate. "The lazy,
yawning drone." --Shak.
And while above he spends his breath,
The yawning audience nod beneath. --Trumbull.
2. To open wide; to gape, as if to allow the entrance or exit
't is now the very witching time of night,
When churchyards yawn. --Shak.
3. To open the mouth, or to gape, through surprise or
4. To be eager; to desire to swallow anything; to express
desire by yawning; as, to yawn for fat livings. "One long,
yawning gaze." --Landor.