English Reference

Word

hour

US/ˈaʊɝ/

UK/ˈaʊə/

Definitions

01sixty minutes

A1 · Beginner Countable noun

n. a period of time that lasts sixty minutes.

n. a unit of time equal to one twenty-fourth of a day, consisting of sixty minutes.

“The flight to Paris takes about one hour from London.”

“The researchers monitored the chemical reaction for exactly one hour to ensure the data remained consistent across all test groups.”

Pitfall

I will see you in a hour.

I will see you in an hour.

Even though 'hour' starts with the consonant 'h', the 'h' is silent. Because it sounds like it starts with a vowel, you must use 'an'.

Synonyms

sixty minutes

02time of day

A1 · Beginner Countable noun

n. a specific point in time, often used when telling the time.

n. a specific point in time or a particular time of day.

“At this hour of the night, most of the shops are closed.”

“The city is remarkably quiet at this early hour, before the morning commuters begin to fill the streets.”

Synonyms

03working time

A2 · Elementary Plural noun

n. the time you spend at your job or the times when a business is open.

n. the fixed or contractual periods of time dedicated to labor or business operations.

“My father works long hours at the hospital during the week.”

“The company recently revised its opening hours to accommodate customers who prefer to shop after finishing their own work day.”

Usage

Usually used in the plural form 'hours'.

Synonyms

04military time

B2 · Upper Intermediate Plural noun Military Technical

n. a way of telling time using twenty-four hours, often used by the police or army.

n. a system of timekeeping based on a twenty-four-hour clock, typically used in military or technical contexts.

“The meeting is scheduled for fourteen-hundred hours.”

“The extraction team was ordered to reach the coordinates by zero-six-hundred hours to avoid detection by enemy patrols.”

Usage

Usually follows a four-digit number and is pronounced as 'hours'.

Synonyms

twenty-four-hour clock

05a distance

B1 · Intermediate Countable noun American English

n. the distance you can travel in sixty minutes.

n. a measure of distance expressed by the time required to travel it at a standard speed.

“The nearest big city is about two hours away by car.”

“Living three hours from the coast makes spontaneous beach trips difficult during the busy summer season.”

06a significant moment

C1 · Advanced Countable noun Literary

n. a very important time or a special moment in someone's life.

n. a significant or critical point in time, often associated with a particular event or person.

“This was her finest hour, when she finally won the gold medal.”

“In the nation's darkest hour, the leader gave a speech that restored hope to millions of citizens.”

Synonyms

Collocations

Common phrases and expressions where native English speakers use the word “hour” in context.

01. hour to appear 02. hours a day 03. hours later 04. hour period 05. hours a week 06. hour mark 07. hours before the eclipse 08. hours earlier

Real-World Examples

“A general strike has paralysed Greece as unions step up industrial action against labour laws introducing a 13-hour work day in a country that already puts in some of the longest hours in Europe.”
The Guardian 1 Oct 2025

Etymology

From Middle English houre, hour, oure, from Old French houre, from Latin hōra (“hour”), from Ancient Greek ὥρα (hṓra, “any time or period, whether of the year, month, or day”), from Proto-Indo-European *yóh₁r̥ (“year, season”). Akin to Old English ġēar (“year”). Doublet of hora and year. Compare horary. Partly displaced native Old English tīd (“time, hour”), whence Modern English tide.

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

Word family

NOUN

ADJECTIVE

Related words

Idioms

Domain

Military

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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English Reference