valid
VAL-id
/ˈvæl.ɪd/
Well-grounded, sound, or logically conclusive; having a conclusion that correctly follows from its premises.
In formal logic, 'valid' applies STRICTLY to an argument's structure. An argument can be completely valid even if its premises are factually absurd.
The story behind the word. Rooted in Latin 'valere' (to be strong), which also gave us 'valiant' and 'value'. A valid argument is one strong enough structurally to bear the weight of its conclusion.
Word relationships
- legitimate: Legitimate implies conforming to recognized rules or standards; valid emphasizes strict logical derivation.
- invalid: Lacking logical force or proper internal structure.
Commonly confused with
- sound: 'Valid' means the structure is correct; 'sound' means the structure is valid AND the premises are factually true.
Word family
- validity (noun): The quality of being logically or factually sound.
- validate (verb): To check or prove the validity of something.
Collocations
- valid argument
- valid point
- valid claim
- logically valid
Idioms & expressions
- hold valid
Example sentences
- "An argument is valid if and only if it takes a form that makes it impossible for the premises to be true and the conclusion nevertheless to be false." Formal Logic
- "Even though I disagree with her conclusion, she raised a completely valid point during the discussion." Daily Debate
Memory hook
VALid arguments are VALiant and strong in structure. Strong logical structure.
When not to use
Do not confuse validity with truth. An argument can be valid while being completely false in reality.
Fun facts
- In law, a 'valid' contract must meet specific legal requirements, reflecting its logical root of structural completeness.
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