B1adjective1K

Indoor

UK /["/ˈɪndɔː(r)/"]/US /["/ˈɪndɔːr/"]/

Definition

located, done or used inside a building

In simple words: Something that is inside a building.

Examples

  • an indoor swimming pool
  • indoor games
  • Poor indoor air quality can result in increased risk of asthma and allergies.
  • the world indoor 200 metres champion

Usage notes

Use 'indoor' to describe activities, spaces, or events that occur inside. It's appropriate in both casual and formal contexts, but not used when referring to outdoor activities.

Grammar pattern

standalone adjective

Memory hint

Think of 'indoors' like being inside a door!

Collocations

  • indoor games
  • indoor activities
  • indoor gardening

Synonyms

  • inside
  • interior
  • enclosed

Antonyms

  • outdoor
  • external

Common mistakes

  • Confusing with 'outdoor'.
  • Using it in reference to natural landscapes.
  • Incorrectly using it to describe weather conditions.