有効
Meanings
1
Describes something that is legally, functionally, or practically valid, effective, or in force. Common in official, technical, and everyday contexts. Antonym: 無効 (invalid).
Antonyms: 無効
This ticket is valid until tomorrow.
The new law will take effect next month.
2
yuko (judo)
A scoring term in judo, awarded for a technique that partially meets the criteria for an ippon. Now obsolete in official IJF rules, but still encountered in older contexts or casual reference.
He scored a yuko with an osoto gari.
Usage patterns
- 〈時〉まで有効valid until 〈time〉
This coupon is valid until the end of next month.
- 〈事〉に対して有効effective against 〈something〉
This vaccine is effective against the new strain of the virus as well.
- 〈場所〉で有効valid at 〈place〉
This ticket is valid at any movie theater nationwide.
- 〈数〉年間有効valid for 〈number〉 years
This passport is valid for ten years.
Expressions
- 有効に使うmake good use of; use effectively; use to one's advantage