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- (adjective): Well grounded or justifiable, pertinent.
- (adjective): Acceptable, proper or correct; in accordance with the rules.
- (adjective): Related to the current topic, or presented within context, relevant.
- (adjective): Of a formula or system: such that it evaluates to true regardless of the input values.
- (adjective): Of an argument: whose conclusion is always true whenever its premises are true.
- (adjective): Effective.
- I will believe him as soon as he offers a valid answer.
- A valid format for the date is MM/DD/YY.
- 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.
- He is a priest now: although his ordination was contrary to the law of the church, it was still valid.