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.

   Synonyms: cogent, substantial

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.

   Synonyms: convincing, logical

6. Archaic.,  robust; well; healthy.

valid

/ ˈvælɪd, vəˈlɪdɪtɪ /

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 invalid 2

6. archaic,  healthy or strong

Other Word Forms

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

Word History and Origins

Origin of valid¹

First recorded in 1565–75; from Latin validus “strong,” from val(ēre) “to be strong” + -idus -id ⁴; prevail ( def. )

Word History and Origins

Origin of valid¹

C16: from Latin validus robust, from valēre to be strong

Example Sentences

And that is the problem, it is one person's opinion and others can make a valid case the other way.

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And because the FA is publicly committed to redistribution, there is ultimately no valid justification for maintaining unequal prize funds.

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The festival says only tickets bought from its official seller See Tickets are valid and they are linked to photo ID to keep them out of the hands of touts.

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Tickets dated for Friday would be valid on Saturday at no extra cost, a spokesperson for National Rail said.

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He received a notice to appear that accused him of overstaying his visa, an allegation the government later updated to claim he had re-entered the country without a valid visa following a 2011 trip abroad.

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Related Words

• accurate 
• authentic 
• binding 
• compelling 
• conclusive 
• credible 
• good 
• lawful 
• legal 
• legitimate 
• logical 
• original 
• persuasive 
• solid 
• true 
• well-founded