Translation guide
This guide covers how to express the idea of 'one part' in Japanese, including literal fractions, portions, components, and roles.
Referring to a single segment, piece, or fraction of something.
The most common and versatile way to say 'one part' or 'a part'. Can be used for physical parts, portions, or abstract components.
Please have one part of this cake.
I only know one part of that story.
Emphasizes 'one portion' or 'a part' more explicitly than 一部. Often used when contrasting with the whole.
Please correct one part of this document.
Literally 'one piece' or 'a fragment'. Used for small, often broken-off parts. Somewhat literary.
One part of the glass had fallen on the floor.
Specifying a proportion, such as in recipes or solutions.
Referring to a share of work or responsibility.
A single component or spare part.
In many contexts, Japanese uses counters or specific nouns instead of directly translating 'one part'. For example, 'one part of a book' is usually 本の一部 (ほんのいちぶ) or 本の一章 (ほんのいっしょう) if it's a chapter. Always consider what kind of 'part' you mean.
小麦粉1部と砂糖1部を加える。
Add one part flour and one part sugar.
各自が一つの分担をこなす。
Each person handles one part.
Where can I buy this one part?