This site will be taken down March 31st, 2026.

This was not an easy decision to make. For the last couple years, I have been struggling to find motivation for this site and to keep up with basic maintenance and security updates. With the rise of AI and more sophisticated tools, the usefulness of sites like this is questionable and traffic has nose-dived. I just don't have it in me to keep doing this. Thank you all for 10 years of support!

Zach

有効

Reading

Kana: ゆうこう
Romaji: yuukou
Kana
Romaji

Definition

1

validity; legality; availability; effectiveness

Kanji

Readings: ユウ、 ウ、 あ.る
Meanings: possess, have, exist, happen, occur, approx
Readings: コウ、 き.く、 ききめ、 なら.う
Meanings: merit, efficacy, efficiency, benefit

Example Sentences

切符(きっぷ)(さん)日間(にちかん)有効(ゆうこう)だ。
➥The ticket holds good for three days.
Full Entry➤
この(けん)は2週間(しゅうかん)有効(ゆうこう)です。
➥This ticket is good for two weeks.
Full Entry➤
それは細菌(さいきん)感染(かんせん)有効(ゆうこう)だ。
➥It is effective against bacterial infections.
Full Entry➤
時間(じかん)有効(ゆうこう)使(つか)いなさい。
➥You have to beat the time.
Full Entry➤
この切符(きっぷ)(さん)日間(にちかん)有効(ゆうこう)だ。
➥This ticket is good for three days.
Full Entry➤
切符(きっぷ)(なん)日間(にちかん)有効(ゆうこう)ですか。
➥How long is the ticket good for?
Full Entry➤
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