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.
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