Word
Definition
adj. located, used, or happening inside a building. You use this to describe things that are protected from the weather outside.
adj. situated, conducted, or used within the interior of a building. Attributive in function; it must precede the noun it modifies.
Examples
“The hotel has a large indoor pool.”
“Because of the heavy rain, the school moved the sports day to an indoor gym.”
“The facility offers various indoor activities, including rock climbing and tennis, allowing athletes to train consistently regardless of the seasonal weather conditions.”
Examples
simple
“The hotel has a large indoor pool.”
contextual
“Because of the heavy rain, the school moved the sports day to an indoor gym.”
complex
“The facility offers various indoor activities, including rock climbing and tennis, allowing athletes to train consistently regardless of the seasonal weather conditions.”
Collocations
Common phrases and expressions where native English speakers use the word “indoor” in context.
Verb
01. prefer indoor
“Many people prefer indoor activities during the cold winter months.”
verb + adj
02. restrict to indoor
“The heavy rain restricted the children to indoor play.”
verb + prep + adj
Adjective
03. primarily indoor
“The species is primarily indoor, rarely venturing into the garden.”
adv + adj
Noun
04. indoor activity
“Reading is a popular indoor activity for rainy days.”
adj + noun
05. indoor lighting
“The soft indoor lighting created a cozy atmosphere in the restaurant.”
adj + noun
06. indoor plant
“She bought a small indoor plant to brighten up her office desk.”
adj + noun
07. indoor pool
“The hotel features a heated indoor pool for guests to use year-round.”
adj + noun
08. indoor sport
“Basketball is a common indoor sport played in schools.”
adj + noun
09. an indoor track and field
“The university recently opened a new indoor track and field facility.”
10. protect from the indoor air
“Air purifiers help protect sensitive individuals from the indoor air pollutants.”
11. suitable for indoor use
“This paint is specifically designed to be suitable for indoor use only.”
Usage
The adjective is attributive, meaning it is placed before a noun (e.g., 'indoor plants') and is not typically used after a linking verb like 'is'.
Pitfall
The cat is indoor.
The cat is indoors.
Indoor is an adjective used before nouns; indoors is the adverb used to describe where an action happens or where something is located.
Etymology
From (with)in + door, first attested 1711.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.
Word family
ADJECTIVE
- Exam level
- CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.B1 PreliminaryIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.4.0–5.0TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 3.0–3.544–71TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.550–784
- Frequency
- Common
- Level
- B1 · IntermediateOxford
- Updated
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QR code
englishreference.com/q/indoor
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「日本語」「カタカナ語」 data: JMdict (EDRDG), CC BY-SA 4.0