valid
valid Lexical Profile
valid Game Scores & Validity
• adjective
Having a sound basis in logic, fact, or reason; reasonable or cogent.
"The committee raised several valid concerns regarding the environmental impact of the proposed construction."
Legally or officially acceptable, binding, and in force; not expired or revoked.
"Travelers must present a valid passport and visa before boarding the international flight."
(of a logical argument or deduction) Constructed such that if the premises are true, the conclusion must necessarily be true.
"A syllogism can be formally valid even if one of its underlying premises is factually mistaken."
Word Nuance & Usage
In formal logic, 'valid' refers strictly to the structural correctness of an argument (where the conclusion necessarily follows from the premises), whereas 'sound' means the argument is both logically valid and has factually true premises.
• Rhymes for valid
Word Origin & Etymology
Borrowed in the late 16th century from Middle French 'valide' or directly from Latin 'validus' ('strong, effective, powerful'), derived from the verb 'valere' ('to be strong, be of value').