in·door

[in-dawr, -dohr]
adjective
occurring, used, etc., in a house or building, rather than out of doors: indoor games.

Origin:
1705–15; aphetic variant of within-door, orig. phrase within (the) door, i.e., inside the house

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
indoor (ˈɪnˌdɔː) [Click for IPA pronunciation guide]
 
adj
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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Indoor is always a great word to know.
So is interrobang. Does it mean:
a scrap or morsel of food left at a meal.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Etymonline
Word Origin & History

indoor
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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Example sentences
Multiple courtyards have been integrated to facilitate indoor and outdoor
  teaching and interaction.
Following is a lists of indoor plants known to be toxic to dogs.
The indoor tanning industry is only two decades old.
Upstairs, you may test a hundred types of shoe on a convenient indoor hiking
  path.
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