indoor
UK: ˈɪn.dɔːr | US: ˈɪn.dɔːr
adj. located, done, or used inside a building
adj. relating to or suited for the interior of a structure
The word "indoor" combines the preposition "in" (Old English "in," meaning "inside") with "door" (Old English "dor," meaning "entryway"). It emerged in the early 19th century to describe activities or spaces situated within the confines of a building, contrasting with "outdoor." The logic is straightforward: "in" + "door" literally implies "inside the door," reflecting its focus on interior spaces.
The gym offers both indoor and outdoor swimming pools.
Indoor plants can improve air quality in your home.
They organized an indoor picnic due to the rainy weather.
The museum features an impressive indoor sculpture garden.
Indoor lighting should be warm and inviting for relaxation.