valid

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In a legal context, valid means that something is binding or actionable: “At the time of the accident his license was no longer valid, so they impounded his car.”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
  1. adjective
    well grounded in logic or truth or having legal force
    “a valid inference”
    “a valid argument”
    “a valid contract”
    Synonyms:
    legitimate
    of marriages and offspring; recognized as lawful
    reasonable, sensible
    showing reason or sound judgment
    binding
    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
    validated
    declared or made legally valid
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    Antonyms:
    invalid
    having no cogency or legal force
    illegitimate
    of marriages and offspring; not recognized as lawful
    bad, uncollectible
    not capable of being collected
    fallacious, unsound
    containing or based on a fallacy
    false
    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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  2. adjective
    still legally acceptable
    “the license is still valid
    Synonyms:
    unexpired
    not having come to an end or been terminated by passage of time
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