English Reference

Word

window

Phoneticswin·dow, stress on the first syllable

US/ˈwɪndoʊ/

UK/wˈɪndəʊ/

Definitions

01opening in a wall

A1 · Beginner Countable noun

n. an opening in a building or car, usually with glass, that lets in light and air.

n. an opening in a wall or vehicle, typically containing glass panes within a frame, designed to admit light and air.

“She opened the window to let some fresh air into the room.”

“The architect designed floor-to-ceiling windows to maximise the natural light and provide an unobstructed view of the valley.”

Synonyms

02computing

A2 · Elementary Countable noun Computing

n. a rectangular area on a computer screen that shows a specific program or page.

n. a separate viewing area on a computer monitor, typically rectangular, that displays a specific application or document.

“You can drag the browser window to the other side of the screen.”

“The developer kept multiple terminal windows open simultaneously to monitor the server logs while deploying the new code.”

Synonyms

03period of opportunity

B2 · Upper Intermediate Countable noun

n. a short amount of time when it is possible to do something.

n. a limited period of time during which an opportunity exists or an action can be performed.

“We have a small window of time to finish the project before the deadline.”

“The launch was delayed because the weather conditions did not align with the narrow three-hour window required for a safe ascent.”

04medical/testing

C1 · Advanced Countable noun Medicine Technical

n. the time between getting an infection and when a test can find it.

n. the interval between the initial infection by a pathogen and the point at which it becomes detectable by diagnostic tests.

“The doctor explained that the virus might not show up during the window period.”

“Modern screening techniques have significantly reduced the window period for detecting blood-borne pathogens after exposure.”

Synonyms

incubation period

05geology

C2 · Proficiency Countable noun Science Technical

n. a hole in a layer of rock that lets you see the older rock underneath.

n. an opening in a tectonic unit, such as a thrust sheet, that exposes the underlying rocks.

“The hikers looked at the geological window where the older granite was visible.”

“The erosion of the overlying limestone created a tectonic window, revealing the metamorphic basement rock beneath the thrust sheet.”

Synonyms

fenster

06to provide with windows

C1 · Advanced Formal

v. to put windows into a building or a room.

v. to furnish or fit a structure with windows. Transitive — takes a direct object.

“The new extension was windowed with large glass panels.”

“The cathedral's clerestory is heavily windowed to allow light to penetrate the deep recesses of the nave.”

Synonyms

Etymology

From Middle English wyndowe, wyndown—itself from Old Norse vindauga, a compound of vindr “wind” and auga “eye”. The Norse word spread across the North Sea into Scots (windae, windock), Faroese (vindeyga), Norwegian (vindu, vindauge), Danish (vindue), and even the forest dialect of Elfdalian (windog), while elbowing out the native Old English ēagþȳrel (“eye-hole”), whose last wheeze survives in the dialect word eyethurl.

A wind-eye was exactly what it said: an unglazed aperture in wall or roof through which the weather could look in and the smoke could look out. Glass arrived later, but the name had already stuck, like a draught that refuses to leave the room.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Related words

Idioms

The word in film

Poster for Rear Window

Poster: Public domain, via Wikimedia Commons.

Rear Window · 1954 · Crime

Directed by:
Alfred Hitchcock
Starring:
Grace Kelly, James Stewart, Thelma Ritter

Alfred Hitchcock directs this celebrated suspense thriller about a wheelchair-bound photographer who passes the time by spying on his courtyard neighbors through his apartment window. The opening frame establishes the physical opening in the wall as an optical frame through which he witnesses a suspected murder.

Domains

GeologyMedicineMilitary

This entry

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.A1 MoversIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.2.0–3.0TOEFL 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: 1.0–1.50–23TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.120–224
Frequency
Very common
Level
A1 · BeginnerOxford
Updated

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