有効 (Yuukou) is a Japanese na-adjective meaning “valid, effective, yuko (judo)”.
Meanings
- na-adjective, nounvalid; effective
- nounyuko (judo)
Examples
切符は三日間有効だ。
The ticket holds good for three days.
切符は何日間有効ですか。
How long is the ticket good for?
それは細菌感染に有効だ。
It is effective against bacterial infections.
Sentences from Tatoeba (CC BY 2.0 FR).