Validly

valid

[val-id]
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; < 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.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
valid (ˈvælɪd)
 
adj
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]
 
'validly
 
adv
 
validity
 
n
 
'validness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

valid
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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