Meaning of valid

val•id

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. (of an argument) so constructed that if the premises are jointly asserted, the conclusion cannot be denied without contradiction.
  6. robust; well; healthy.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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