English Reference

Word

fifth

US/ˈfɪfθ/

UK/fˈɪfθ/

Definitions

01number five in a series

A1 · Beginner

num. coming after the fourth thing in a list or sequence.

num. the ordinal number matching the cardinal number five.

“This is the fifth time I have tried to call him today.”

“The fifth chapter of the report provides a detailed analysis of the fiscal year's unexpected losses.”

02a fraction

A2 · Elementary Countable noun Mathematics

n. one of five equal parts of a whole thing.

n. one of five equal parts into which a whole is or may be divided.

“He ate a fifth of the cake before anyone else arrived.”

“Approximately one fifth of the local population remains below the poverty line despite recent economic growth.”

Synonyms

one-fifth

03musical interval

B2 · Upper Intermediate Countable noun Music

n. the distance between the first and fifth notes in a musical scale.

n. the interval between a given tone and another tone five scale degrees above it.

“The singer struggled to hit the perfect fifth in the chorus.”

“The composer utilized a series of parallel fifths to create a stark, medieval atmosphere in the opening movement.”

04the right to remain silent

C1 · Advanced Countable noun Law American English · Informal

n. the right in the US to refuse to answer questions in court to avoid getting in trouble.

n. the Fifth Amendment to the US Constitution, specifically the right against self-incrimination.

“When asked who broke the window, the boy decided to plead the fifth.”

“The witness chose to plead the fifth rather than risk admitting to his involvement in the conspiracy.”

Usage

Usually used in the phrase 'plead the fifth'.

05a bottle of alcohol

C1 · Advanced Countable noun American English · Informal

n. a bottle of strong alcohol that holds about 750 milliliters.

n. a unit of volume for liquor, formerly one-fifth of a US gallon, now standardized as 750 milliliters.

“He bought a fifth of whiskey for the weekend party.”

“The shelf was lined with various fifths of gin and vodka, all imported from small European distilleries.”

Etymology

PIE word *pénkʷe From Middle English fifthe, fifte, fift, from Old English fīfta (“fifth”), from Proto-Germanic fimftô (“fifth”) or femftô, equivalent to five + -th (ordinal suffix). Cognate with Scots fift, fyft (“fifth”), North Frisian fyfde (“fifth”), West Frisian fyfde (“fifth”), Dutch vijfde (“fifth”), Low German fifte, föfte, füfte (“fifth”), German fünfte (“fifth”), Danish femte (“fifth”), Swedish femte (“fifth”), Icelandic fimmta (“fifth”).

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

Idioms

Domain

Music

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
Common
Level
A1 · BeginnerOxford
Updated

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