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indoor

[in-dawr, -dohr] /ˈɪnˌdɔr, -ˌdoʊr/
adjective
1.
occurring, used, etc., in a house or building, rather than out of doors:
indoor games.
Origin
1705-1715
1705-15; aphetic variant of within-door, orig. phrase within (the) door, i.e., inside the house
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for in door

indoor

/ˈɪnˌdɔː/
adjective (prenominal)
1.
of, situated in, or appropriate to the inside of a house or other building: an indoor tennis court, indoor amusements
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for in door

indoor

adj.

1711, from within door (opposed to outdoor); the form indoors is first attested 1799 in George Washington's writings.

Online Etymology Dictionary, © 2010 Douglas Harper
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