indoor

[in-dawr, -dohr]
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Origin of indoor

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 Unabridged Dictionary, © Random House, Inc. 2018


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British Dictionary definitions for indoor

indoor

adjective (prenominal)
  1. of, situated in, or appropriate to the inside of a house or other buildingan 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

Word Origin and History for 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