なna-adjective
valid
yuukouda
meaning: is valid
state
feeling
examples
このクーポン、今月の末まで有効だって。
kono kuupon, kongetsu no sue made yuukou datte.
This coupon is good until the end of the month, apparently. casual
会員証は発行日から一年間有効となります。
kaiinshou wa hakkoubi kara ichinenkan yuukou to narimasu.
The membership card is valid for one year from the date of issue. formal