Translation guide
The English word "ruler" has two main meanings: a measuring tool and a person who governs. This guide covers both, with natural Japanese expressions for each.
A straight strip or cylinder of plastic, wood, metal, etc., used for measuring or drawing straight lines.
General word for a ruler or straightedge used for measuring or drawing lines. Often used in school and office contexts.
定規で線を引いてください。
Please draw a line with a ruler.
この定規は30センチです。
This ruler is 30 centimeters.
Specifically a ruler for measuring length, often a flat strip with markings. Slightly more traditional or formal than 定規.
物差しで長さを測る。
Measure the length with a ruler.
Loanword from English 'scale', often used for rulers in technical or design contexts, or for measuring tapes.
設計図を描くときはスケールを使います。
I use a scale ruler when drawing blueprints.
Technical term for a straight ruler, as opposed to a curved or specialized ruler. Used in drafting.
直線定規で正確な線を引く。
Draw precise lines with a straight ruler.
A person who rules or governs a country, region, or group; a sovereign or leader.
General term for a ruler, one who rules or controls. Can be used for monarchs, dictators, or any person in power.
彼は国の支配者として君臨した。
He reigned as the ruler of the country.
Emphasizes governing or administering a territory. More formal and often used in historical or political contexts.
Specifically a monarch, such as a king, queen, or emperor. Implies hereditary sovereignty.
A person in charge of administration; a statesman or political ruler. Often used in discussions of governance.
定規 is the most common word for a ruler used in school or office. 物差し specifically refers to a measuring ruler, often a flat wooden or plastic strip, and can sound slightly more traditional. In everyday conversation, 定規 is usually sufficient.
While 支配者 is a direct translation, it can sound harsh or authoritarian. In contexts where you mean a monarch or leader, consider 君主 or 統治者 depending on the nuance. For democratic leaders, 指導者 (leader) might be more appropriate.
まっすぐな線を引くために定規が必要です。
I need a ruler to draw a straight line.
その王国の支配者は賢明だった。
The ruler of the kingdom was wise.
The ruler implemented fair policies.
The ruler of that country had immense power.
Rulers should listen to the voice of the people.