noun
Abstract noun referring to the quality of being useful or practical. Common in formal, technical, or evaluative contexts.
この研究の有用性はまだ証明されていない。
The usefulness of this research has not yet been proven.
新しいツールの有用
Evaluate the utility of the new tool.
実用性 emphasizes practical applicability, whereas 有用性 is broader and can include theoretical usefulness.
Compound of 有用 (useful) + 性 (-ness, -ity), a productive suffix forming abstract nouns from adjectives.