Located, occurring, or designed for use inside a building or enclosed space. Opposite of outdoor activities or environments.
Compound word formed from 'in' + 'door' in the late 18th century. Reflects the growing distinction between inside and outside spaces as architecture became more sophisticated.
The concept of 'indoor' is surprisingly recent in human history - most activities were simply 'activities' until we developed complex enough buildings to create truly distinct indoor environments. The word reflects our modern lifestyle where we spend roughly 90% of our time indoors.
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