Pronunciation: (val'id),[key] —adj. 1. sound; just; well-founded: a valid reason. 2. producing the desired result; effective: a valid antidote for gloom. 3. having force, weight, or cogency; authoritative.
4. legally sound, effective, or binding; having legal force: a valid contract. 5. Logic.(of an argument) so constructed that if the premises are jointly asserted, the conclusion cannot be denied without contradiction.
6. Archaic.robust; well; healthy.