必要性

The quality or state of being necessary; necessity.

Readings

Other forms

必要 hitsuyou - necessary

Noun

Necessity

Refers to the abstract quality or degree of being required, focusing on the justification for a need.

Good to know

必要性（ひつようせい） means necessity or the degree to which something is needed.

It comes from 必要（ひつよう）, “necessary,” plus 性（せい）, which turns it into an abstract noun.

Key difference:

必要（ひつよう） says something is needed. 必要性（ひつようせい） discusses whether that need exists, makes sense, or is justified.

Use 必要性（ひつようせい） in more formal or explanatory contexts, especially when discussing policies, decisions, plans, or arguments.

Common patterns:

必要性を感じる（ひつようせいをかんじる）: to feel a need 必要性を問う（ひつようせいをとう）: to question whether something is necessary 必要性がある（ひつようせいがある）: there is a need

Example

彼は新しいシステムの必要性を説明した。

He explained the necessity of the new system.

4 more examples in the mobile app

Free forever · No card needed

Study this term on the app

Every word on Amenokori — including 必要性 — comes with full meanings, example sentences, audio, and FSRS-powered review scheduling. 10K+ entries from N5 to N1.

Zero deck building Full context & nuance FSRS algorithm

App Store Google Play

100% free to start

amenokori · review

5 day streak

VOCAB 2 / 30

必要性

ひつようせい

The quality or state of being necessary; necessity.

Example

この言葉を覚えましょう。

Let's memorize this word.

Again

Hard

Good

Easy