a passage, hall, or antechamber between the outer door and the interior parts of a house or building.
Railroads. an enclosed space at the end of a passenger car, serving as a sheltered entrance to the car from another car or from outside the train.
Anatomy, Zoology. any of various cavities or hollows regarded as forming an approach or entrance to another cavity or space, as that of the internal ear. See diag. under ear.
verb (used with object), vestibuled, vestibuling.
to provide with a vestibule.

1615–25; < Latin vestibulum forecourt, entrance Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vestibule (ˈvɛstɪˌbjuːl)
1.  a small entrance hall or anteroom; lobby
2.  any small bodily cavity or space at the entrance to a passage or canal
[C17: from Latin vestibulum]

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

1623, "a porch," later "antechamber, lobby" (1730), from Fr. vestible, from L. vestibulum "forecourt, entrance," of unknown origin.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

vestibule ves·ti·bule (věs'tə-byōōl')
A cavity, chamber, or channel that leads to or is an entrance to another cavity, especially that of the ear.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
vestibule   (věs'tə-byl')  Pronunciation Key 
An oval cavity in the inner ear that together with the semicircular canals makes up the organ that maintains equilibrium in vertebrates.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Cell phones are restricted to the vestibule or card room.
The lowest part of the stomach is at the pyloric vestibule, which reaches to
  the region of the umbilicus.
At the appointed time the funeral procession forms in the vestibule.
Dramatic chandeliers hover over the vestibule and lobby lounge.
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