noun
main part; key part; principal section
Refers to the most important or central part of something, such as a document, structure, or argument.
論文の主要部をまとめてください。
Please summarize the main part of the paper.
この建物の主要部は江戸時代に建てられた。
The main part of this building was built in the Edo period.
noun
Linguistics term for the word that determines the syntactic category of a phrase.
「大きな犬」という句では、「犬」が主要部です。
In the phrase 'big dog,' 'dog' is the head.