ゆうこう有効yuukou
1.

Describes a state in which something has a practical or beneficial effect, enabling it to be useful or advantageous in a given context or situation.

2.

Refers to something that possesses legal authority or power, allowing it to hold weight and be recognized in legal matters.

3.

In the context of martial arts, particularly judo, indicates a technique that is close to achieving a superior level of effectiveness, implying near success in a competitive setting.

Example:

その切符は一週間有効です。

ゆうこうきげん有効期限yuukoukigen
1.

The date until which a product, service, or agreement remains valid or usable, after which it becomes inactive or void.

2.

A specified date that indicates until when a particular privilege or benefit can be utilized, often marking the end of its legal or practical applicability.

3.

The predetermined point in time that signifies the cessation of validity for items such as contracts, registrations, or payment mediums like credit cards.

Example:

このビザの有効期限はどれくらいですか。

ゆうこうせい有効性yuukousei
1.

The degree to which something is successful in producing a desired result or outcome.

2.

The extent to which a concept, theory, or measure accurately represents or conforms to a particular standard or requirement.

ゆうこうきかん有効期間yuukoukikanゆうこうきげん有効期間yuukoukigen
1.

The duration during which something remains valid and can be used effectively.

2.

The specified timeframe in which a particular item or offer is active and can be recognized as legitimate.

Example:

免許証の有効期間が切れてしまった場合は、次の方法で新たな免許証の交付を受けることができる。

ゆうこうだ有効打yuukouda
1.

A decisive hit that significantly impacts the outcome of a conflict or competition, often leading to an advantage for the individual delivering it.

2.

A blow or action in a contest that effectively scores points or demonstrates dominance, highlighting the skill and precision of the performer.

3.

An important move or strike in a game or fight that can alter the momentum and effectively shift the balance in favor of one party.

4.

A successful hit that not only connects but also has the potential to demoralize or weaken the opponent's resolve or strategy.