こうりょく効力kouryoku
1.
The capacity or ability of something to produce a desired result or effect when utilized.
2.
The degree to which a substance or action achieves its intended purpose or function, often used in the context of medicines or agreements.
3.
The state of being valid or operative, indicating that something holds juristic or practical significance.
4.
The inherent strength or power of an action or object to influence outcomes, particularly in legal or formal contexts.
Example:
その法律はもう効力はなくなっている。