English Reference

Word

ruler

US/ˈɹuɫɝ/

UK/ɹˈuːlɐ/

Definitions

01measuring tool

A1 · Beginner Countable noun

n. a flat, straight tool used for measuring length or drawing straight lines.

n. a rigid, flat instrument with marked graduations used for measuring linear distance or as a straightedge.

“Use a ruler to make sure the line is exactly ten centimetres long.”

“The student used a wooden ruler to measure the dimensions of the specimen before sketching it in her notebook.”

Synonyms

straightedgerule

02leader

A2 · Elementary Countable noun

n. a person who has the power to control a country or group, like a king or queen.

n. a person who exercises supreme authority or dominion over a territory or people.

“The ancient ruler built many beautiful temples during his long reign.”

“Historians often debate whether the ruler was a benevolent visionary or a tyrant who prioritised expansion over the welfare of his subjects.”

Antonyms

03to hit with a ruler

C2 · Proficiency Archaic

v. to hit someone with a ruler as a punishment.

v. to strike a person, typically a student, with a ruler as a form of corporal punishment.

“In the old days, teachers might ruler a student for being late.”

“The memoir describes a harsh Victorian classroom where the master would ruler any child who failed to recite their verses perfectly.”

Usage

This verb is transitive and takes a direct object, usually a person.

Teaching tip

This sense is archaic and refers to historical school discipline; it is not used in modern educational contexts.

Synonyms

Etymology

From Middle English reuler; equivalent to rule + -er.

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

Word family

Related words

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
Frequent
Level
A1 · Beginner
Updated

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