Translation guide
The English word "primary" has several distinct meanings, from "most important" to "first in order" to "elementary education." This guide breaks down these meanings and provides natural Japanese equivalents for each.
Expressing that something is the most important, principal, or chief among others.
A common adjective meaning 'main' or 'principal'. Used before nouns.
主な理由は何ですか。
What is the primary reason?
主な目的は教育の改善です。
The primary objective is to improve education.
More formal than 主な, often used in written or technical contexts.
主要な産業は観光です。
The primary industry is tourism.
Literally 'number one', emphasizes top priority or foremost importance.
安全が第一の関心事です。
Safety is the primary concern.
Loanword from English, used in specific contexts like 'primary care' or 'primary color', but not for general 'main'.
プライマリーケア
primary care
Referring to something that comes first in a sequence, or the initial stage.
Means 'early stage' or 'initial'. Used for phases, symptoms, etc.
初期の症状は軽いです。
The primary symptoms are mild.
計画はまだ初期の段階です。
The plan is still in its primary stage.
Also used for 'first in order', like primary election or first step.
第一段階
primary stage
Used in technical contexts like 'primary coil' or 'primary source'. Not for everyday 'first'.
一次資料
primary source
Referring to the first stage of formal schooling, typically for young children.
The standard term for elementary school in Japan (grades 1-6).
彼は小学校の先生です。
He is a primary school teacher.
A preliminary election to choose a party's candidate for the main election.
Standard term for 'primary election'. Often shortened to 予備選.
予備選挙で彼が勝ちました。
He won the primary election.
One of the basic colors that can be mixed to create other colors.
The standard term for primary colors in art and design.
赤、青、黄色は光の三原色ですか？
Are red, blue, and yellow the three primary colors of light?
An original document or firsthand account used in research.
Standard academic term for primary source.
歴史研究では一次資料が重要です。
Primary sources are important in historical research.
Also means 'original source', but less common than 一次資料.
主な (omona) is more common in everyday speech and writing. 主要な (shuyōna) is slightly more formal and often used in reports or news. Both mean 'main' or 'primary', but 主要な can imply 'major' or 'key' as well.
The loanword プライマリー is only used in specific technical or borrowed contexts (e.g., primary care, primary election). For general 'primary' meaning 'most important', use 主な or 主要な.
Formal term for 'elementary education' as a system or concept.
初等教育は無償です。
Primary education is free.
Loanword used in political contexts, especially when referring to US primaries.
アメリカの大統領予備選挙はプライマリーと呼ばれます。
The US presidential primary is called a 'primary'.
原資料にあたる必要がある。
It is necessary to consult primary sources.