an act or instance of making or becoming open.
the act of a person or thing that opens.
an unobstructed or unoccupied space or place.
a void in solid matter; a gap, hole, or aperture.
a tract of land thinly wooded as compared with adjoining forest tracts.
the act of beginning; start; commencement: the opening of a new session of Congress.
the first part or initial stage of anything.
an employment vacancy; an unfilled position or job: There are no openings for clerks today.
an opportunity; chance.
a formal or official beginning, as of a sport season or a season's sale of goods: the opening of the deer-hunting season; Swimsuits sold well at the summer opening.
the first performance of a theatrical production.
the first public showing or use of something: the opening of an art exhibition.
a celebration of the first public showing or performance or of the first use or start of something: The new supermarket is going to give away prizes at its opening.
Law. the statement of the case made by counsel to the court or jury preliminary to adducing evidence.
a mode of beginning a game: a manual of chess openings.

1125–75; Middle English; see open, -ing1

preopening, adjective
self-opening, adjective
unopening, adjective

4. orifice; slit, breach, rift, chasm, cleft, fissure, rent.

1. closing. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
opening (ˈəʊpənɪŋ)
1.  the act of making or becoming open
2.  a vacant or unobstructed space, esp one that will serve as a passageway; gap
3.  chiefly (US) a tract in a forest in which trees are scattered or absent
4.  the first part or stage of something
5.  a.  the first performance of something, esp a theatrical production
 b.  (as modifier): the opening night
6.  a specific or formal sequence of moves at the start of any of certain games, esp chess or draughts
7.  an opportunity or chance, esp for employment or promotion in a business concern
8.  law the preliminary statement made by counsel to the court or jury before adducing evidence in support of his case

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"action of open (v.)," late 12c. Meaning "vacant space, hole" is attested from early 13c. Sense of "action of beginning (something)" is from 1712; meaning "first performance of a play" is 1855; "start of an art exhibit" is from 1905. Sense of "opportunity, chance" is from 1793.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

opening o·pen·ing (ō'pə-nĭng)

  1. The act or an instance of becoming unobstructed or of being made to open.

  2. An open space that serves as a passage or gap.

  3. A breach or an aperture.

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 for openings
Air is taken in through spiracles, openings on the sides of the abdomen.
They have two openings in their body cavity an incurrent and an excurrent siphon.
They are catalogued in reference works such as the encyclopaedia of chess openings.
The cavate house, which is dug out, by using natural recesses or openings.
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