A valid argument is one that is well-grounded in fact, law or logic. "Their argument for annulment was valid because they had never even met and their marriage was the result of a clerical error at town hall."

Something is valid when it can be supported or backed-up, or if it is functional: “She figured her password was valid because she had just set it.” In a legal context, valid means that something is binding or actionable: “At the time of the accident his license was no longer valid, so they impounded his car.” The logical grounding of an argument can be valid: “That’s a valid point about Santa being too large to fit down a chimney.”

Definitions of valid

adj well grounded in logic or truth or having legal force

“a valid inference”
“a valid argument”
“a valid contract”
of marriages and offspring; recognized as lawful
reasonable, sensible
showing reason or sound judgment
executed with proper legal authority
effectual, legal, sound
having legal efficacy or force
legitimate, logical
based on known statements or events or conditions
reasoned, sound, well-grounded
logically valid
declared or made legally valid
having no cogency or legal force
of marriages and offspring; not recognized as lawful
bad, uncollectible
not capable of being collected
fallacious, unsound
containing or based on a fallacy
erroneous and usually accidental
invalidated, nullified
deprived of legal force
null, void
lacking any legal or binding force
sophistic, sophistical
plausible but misleading
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adj still legally acceptable

“the license is still valid
not having come to an end or been terminated by passage of time

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