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7 Essential Words of Fall

valid

[val-id] /ˈvæl ɪd/
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
1565-1575
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.
Synonyms
3. substantial, cogent. 5. logical, convincing.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for prevalid

valid

/ˈvælɪd/
adjective
1.
having some foundation; based on truth
2.
legally acceptable: a valid licence
3.
  1. having legal force; effective
  2. having legal authority; binding
4.
having some force or cogency: a valid point in a debate
5.
(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)
6.
(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
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Word Origin and History for prevalid

valid

adj.

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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