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.
Dictionary.com 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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