indoor

adjective

in·​door ˈin-ˈdȯr 

1

: of or relating to the interior of a building

2

: living, located, or carried on within a building

an indoor sport

Examples of indoor in a Sentence

Recent Examples on the Web

It was first tested in an indoor laboratory using emulated energy sources and battery storage. — Maria Mocerino, Interesting Engineering, 3 Aug. 2026

Cantero, an indoor/outdoor bar, opens up to the pool and serves cocktails (including frozen bevvies) and food from Veracruz. — Condé Nast, Condé Nast Traveler, 1 Aug. 2026

Two stages — one outdoor and one indoor — will host 11 performances and demonstrations throughout the day. — Camila Pedrosa, Sacbee.com, 1 Aug. 2026

The boundary between indoor and outdoor living is nearly erased as floor-to-ceiling glass windows and walls are flung open to redefine the term cross-breeze. — Catherine Dunwoody, Forbes.com, 1 Aug. 2026

Word History

First Known Use

1711, in the meaning defined at sense 1

Phrases Containing indoor

• indoor plumbing

Rhymes for indoor

• abhor
• abor
• adore
• afore
• ardour
• ashore
• backdoor
• before
• bookstore
• candour
• centaur
• claymore

Kids Definition

indoor

adjective

in·​door ˌin-ˌdō(ə)r 

-ˌdȯ(ə)r

1

: of or relating to the interior of a building

2

: done, living, used, or belonging within a building

an indoor sport