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.

1565–75; < Latin validus strong, equivalent to val(ēre) to be strong + -idus -id4

validly, adverb
validness, noun
nonvalid, adjective
nonvalidly, adverb
nonvalidness, noun
prevalid, adjective
prevalidly, adverb
quasi-valid, adjective
quasi-validly, adverb

valet, valid.

3. substantial, cogent. 5. logical, convincing. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
valid (ˈvælɪd)
1.  having some foundation; based on truth
2.  legally acceptable: a valid licence
3.  a.  having legal force; effective
 b.  having legal authority; binding
4.  having some force or cogency: a valid point in a debate
5.  logic Compare invalid (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
6.  archaic healthy or strong
[C16: from Latin validus robust, from valēre to be strong]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1570s, "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 1640s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

Valid definition

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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Example sentences
There are valid legal and moral issues here, but there were also real-world
  questions without good answers.
Military discounts are not valid on all sailings and may be limited to a
  certain number of cabins.
The license must be valid and remain valid for the entire time they wish to
  rent the vehicle.
Most hotels require a valid credit card number to hold a reservation.
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