verb (used without object)
to open the mouth somewhat involuntarily with a prolonged, deep inhalation and sighing or heavy exhalation, as from drowsiness or boredom.
to open wide like a mouth.
to extend or stretch wide, as an open and deep space.
verb (used with object)
to say with a yawn.
Archaic. to open wide, or lay open, as if by yawning.
an act or instance of yawning.
an opening; open space; chasm.
Also, yawner. Informal. something so boring as to make one yawn: Critics say the new fashions are one big yawn.

before 900; Middle English yanen, yonen (v.), alteration of yenen, Old English ge(o)nian; akin to Old English gānian, ginan, Old Norse gīna, G gähnen, Latin hiāre (see hiatus), Greek chaínein to gape (see chasm)

yawn, yon.

1–3. gape.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
yawn (jɔːn)
1.  (intr) to open the mouth wide and take in air deeply, often as in involuntary reaction to tiredness, sleepiness, or boredom
2.  (tr) to express or utter while yawning
3.  (intr) to be open wide as if threatening to engulf (someone or something): the mine shaft yawned below
4.  the act or an instance of yawning
[Old English gionian; related to Old Saxon ginōn, Old High German ginēn to yawn, Old Norse gjā gap]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1300, yenen, yonen, from O.E. ginian, gionian "open the mouth wide, gape," from P.Gmc. *gin- (cf. O.N. gina "to yawn," Du. geeuwen, O.H.G. ginen, Ger. gähnen "to yawn"), from PIE *gh(e)i- (cf. O.C.S. zijajo "to gape," Lith. zioju, Czech zivati "to yawn," Gk. khainein, L. hiare "to yawn, gape,"
Skt. vijihite "to gape, be ajar"). Noun meaning "act of yawning" is recorded from 1697. Yawner "something boring" is Amer.Eng. slang first recorded 1942 (yawn in this sense is attested from 1889).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

yawn (yôn)
v. yawned, yawn·ing, yawns
To open the mouth wide with a deep inhalation, usually involuntarily from drowsiness, fatigue, or boredom. n.
The act of yawning.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Then he gave a prolonged yawn, opening his mouth as wide as possible.
To the modern mind, beauty has always been a bit of a yawn, even if beautiful
  people continue to attract our stares.
For every reviewer who applauds, there is one who stifles a yawn.
She relaxed and stretched in a yawn, hitting a rafter of cork.
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