valid

Definitions

1. adjective

   Well-grounded or justifiable, pertinent.

   Example

   • I will believe him as soon as he offers a valid answer.
   ≈arguable≈groundly≈proper≈warrantable
2. adjective

   Acceptable, proper or correct or in accordance with the rules.

   Examples

   • A valid format for the date is DD/MM/YY.
   • Do not drive without a valid license.
   ≈legit≈legitimate
3. adjective

   Related to the current topic, or presented within context, relevant.

   ≈applicable≈germane≈applicable≈apposite≈apt +11 more
4. adjective

   Of a formula or system: such that it evaluates to true regardless of the input values.

5. adjective

   Of an argument: whose conclusion is always true whenever its premises are true.

   Example

   • An argument is valid if and only if the set consisting of both (1) all of its premises and (2) the contradictory of its conclusion is inconsistent.
6. adjective

   Genuine, as distinguished from efficient or regular, in reference to a sacrament (theology).