- 1
Well-grounded or justifiable, pertinent.
- I will believe him as soon as he offers a valid answer.
- 2
Acceptable, proper or correct; in accordance with the rules.
- A valid format for the date is DD/MM/YY.
- Do not drive without a valid license.
- 3
Related to the current topic, or presented within context, relevant.
- 4
Of a formula or system: such that it evaluates to true regardless of the input values.
- 5
Of an argument: whose conclusion is always true whenever its premises are true.
- 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
Genuine - as distinguished from efficient or regular - sacrament.
syn. acceptable · allowable · legit · legitimate · leveful · licit · permissible · rightful · rulable · true · valid
ant. invalid · nonvalid · disallowed · illegitimate · illicit · nonstandard · nude · null