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[val-id] /ˈvæl ɪd/
sound; just; well-founded:
a valid reason.
producing the desired result; effective:
a valid antidote for gloom.
having force, weight, or cogency; authoritative.
legally sound, effective, or binding; having legal force:
a valid contract.
Logic. (of an argument) so constructed that if the premises are jointly asserted, the conclusion cannot be denied without contradiction.
Archaic. robust; well; healthy.
Origin of valid
1565-75; < Latin validus strong, equivalent to val(ēre) to be strong + -idus -id4
Related forms
validly, adverb
validness, noun
nonvalid, adjective
nonvalidly, adverb
nonvalidness, noun
prevalid, adjective
prevalidly, adverb
quasi-valid, adjective
quasi-validly, adverb
Can be confused
valet, valid.
3. substantial, cogent. 5. logical, convincing. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for valid
Contemporary Examples
Historical Examples
  • It is evident that such a decision as this does not rest on valid motives but rather on the accident of subjective conditions.

    The Mind and Its Education George Herbert Betts
  • This would be his own excuse, and does it not seem a valid one?

  • Santa Anna upon this pronounced in Perote, declaring the election of Guerrero valid.

    Mexico Susan Hale
  • Here are the two elements of a valid appointment, and they must concur.

    The Electoral Votes of 1876 David Dudley Field
  • "That is the only valid argument I ever heard in favor of the bourgeois," I said.

    John Marvel, Assistant Thomas Nelson Page
British Dictionary definitions for valid


having some foundation; based on truth
legally acceptable: a valid licence
  1. having legal force; effective
  2. having legal authority; binding
having some force or cogency: a valid point in a debate
(logic) (of an inference or argument) having premises and conclusion so related that whenever the former are true the latter must also be true, esp (formally valid) when the inference is justified by the form of the premises and conclusion alone. Thus Tom is a bachelor; therefore Tom is unmarried is valid but not formally so, while today is hot and dry; therefore today is hot is formally valid Compare invalid2 (sense 2)
(archaic) healthy or strong
Derived Forms
validly, adverb
validity (vəˈlɪdɪtɪ), validness, noun
Word Origin
C16: from Latin validus robust, from valēre to be strong
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for valid

1570s, "having force in law, legally binding," from Middle French valide, from Latin validus "strong, effective," from valere "be strong" (see valiant). The meaning "supported by facts or authority" is first recorded 1640s.

Online Etymology Dictionary, © 2010 Douglas Harper
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valid in Technology

A dataflow language.
["A List-Processing-Oriented Data Flow Machine Architecture", Makoto Amamiya et al, AFIPS NCC, June 1982, pp. 143-151].
The Free On-line Dictionary of Computing, © Denis Howe 2010
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