Meaning of valid in English | Powered by Free Dictionary API

adjective

• Well grounded or justifiable, pertinent.

  Example: I will believe him as soon as he offers a valid answer.

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

  Example: A valid format for the date is MM/DD/YY.

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

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

• 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.

• Effective.

  Example: He is a priest now: although his ordination was contrary to the law of the church, it was still valid.