› a valid ticket, document, agreement, etc. is legal and can be officially accepted, usually for a particular period of time: Is this ticket still valid? A credit card is not usually accepted as a valid form of I.D. Applicants must be in possession of a valid passport.valid for 6 months, a year, etc. Permits are valid for a year. The court decided shareholders had a valid claim against the Chairman for his part in the company's downfall.
› IT valid data or details are accepted by a computer system because they are correct
› that can be accepted as being true or reasonable: The points she made were perfectly valid. validly adverb › Make sure that your company documents have been validly signed.