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

Think melted cheese cuisine (raclette, fondue, tartiflette) and spa hotels with outdoor fire pits and indoor hot tubs, plus easy access to skiing, and every other winter sport imaginable. —Larry Olmsted, Forbes.com, 28 Jan. 2026

Insurance companies, environmental health academics, and professionals focused on addressing indoor environmental hazards have all disagreed on the necessary steps to restore homes, creating confusion for survivors. —Tony Briscoe, Los Angeles Times, 28 Jan. 2026

Use a grow light to supplement any natural light your indoor space gets. —Megan Hughes, Better Homes & Gardens, 28 Jan. 2026

Fellow Charlottean Jim Beatty was in the process of becoming a track star and would eventually become the first man to run a four-minute indoor mile. —Scott Fowler, Charlotte Observer, 28 Jan. 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