suffix
strength; power; proficiency; ability
Suffix attached to nouns to indicate the strength, power, or ability related to that noun. Common in compounds such as 体力 (physical strength), 学力 (academic ability), 経済力 (economic power).
彼は語学力が高い。
He has high language proficiency.
この仕事には集中力が必要だ。
This job requires the ability to concentrate.