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valid

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val⋅id

  [val-id]
Use valid in a Sentence
–adjective
1. sound; just; well-founded: a valid reason.
2. producing the desired result; effective: a valid antidote for gloom.
3. having force, weight, or cogency; authoritative.
4. legally sound, effective, or binding; having legal force: a valid contract.
5. Logic. (of an argument) so constructed that if the premises are jointly asserted, the conclusion cannot be denied without contradiction.
6. Archaic. robust; well; healthy.
Origin:
1565–75; < L validus strong, equiv. to val(ēre) to be strong + -idus -id 4

Related forms:
val⋅id⋅ly, adverb
val⋅id⋅ness, noun

Synonyms:
3. substantial, cogent. 5. logical, convincing.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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val·id   (vāl'ĭd)   
adj.  

  1. Well grounded; just: a valid objection.

  2. Producing the desired results; efficacious: valid methods.

  3. Having legal force; effective or binding: a valid title.

  4. Logic

    1. Containing premises from which the conclusion may logically be derived: a valid argument.

    2. Correctly inferred or deduced from a premise: a valid conclusion.

  5. Archaic Of sound health; robust.


[French valide, from Old French, from Latin validus, strong, from valēre, to be strong; see wal- in Indo-European roots.]
va·lid'i·ty, val'id·ness n., val'id·ly adv.
Synonyms: These adjectives describe assertions, arguments, conclusions, reasons, or intellectual processes that are persuasive because they are well founded. What is valid is based on or borne out by truth or fact or has legal force: a valid excuse; a valid claim.
What is sound is free from logical flaws or is based on valid reasoning: a sound theory; sound principles.
Something cogent is both sound and compelling: cogent testimony; a cogent explanation.
Convincing implies the power to dispel doubt or overcome resistance or opposition: convincing proof.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

valid 
1571, "having force in law, legally binding," from M.Fr. valide, from L. validus "strong, effective," from valere "be strong" (see valiant). The meaning "supported by facts or authority" is first recorded 1648. Validate (v.) is recorded from 1648.
Online Etymology Dictionary, © 2001 Douglas Harper
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Legal Dictionary

Main Entry: val·id
Pronunciation: 'va-l&d
Function: adjective
1 : having legal efficacy or force valid license>; especially : executed with proper authority and form valid contract> valid search>
2 : having a legitimate basis : JUSTIFIABLE valid reason for terminating the employee>
3 : appropriate to the end in view —va·lid·i·ty /v&-'li-d&-tE/ noun —val·id·ly adverb
Merriam-Webster's Dictionary of Law, © 1996 Merriam-Webster, Inc.
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Computing Dictionary

Valid
A dataflow language.
["A List-Processing-Oriented Data Flow Machine Architecture", Makoto Amamiya et al, AFIPS NCC, June 1982, pp. 143-151].
(1995-02-14)

The Free On-line Dictionary of Computing, © 1993-2007 Denis Howe
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