source: Airport passport GIF - Find on GIFER

(of an argument or point) having a sound basis in logic or fact; reasonable or cogent:

〈理由･議論･批判などが〉妥当な, もっともな, 根拠のある(→ reasonable)

e.g. a valid criticism.

legally binding due to having been executed in compliance with the law:

〈切符･書類･契約などが〉(法的に)有効な, 公式, 正式の; «…に» 効力のある «for» (↔ invalid2)

e.g. a valid contract.

legally or officially acceptable:

〘コンピュ〙 (認証などで)有効な, 正しい.

e.g. the visas are valid for thirty days

e.g. a valid password.

late 16th century: from French valide or Latin validus ‘strong’, from valere ‘be strong’.