(adjective) still legally acceptable; “the license is still valid”
(adjective) well grounded in logic or truth or having legal force; “a valid inference”; “a valid argument”; “a valid contract”
Source: WordNet® 3.1
valid (comparative more valid, superlative most valid)
Well grounded or justifiable, pertinent.
Acceptable, proper or correct; in accordance with the rules.
Related to the current topic, or presented within context, relevant.
(logic) Of a formula or system: such that it evaluates to true regardless of the input values.
(logic) Of an argument: whose conclusion is always true whenever its premises are true.
(Christianity, theology) Effective.
• (in logic: argument whose conclusion is always true whenever its premises are all true): sound
• Advil, davil
Val"id, a. Etym: [F. valide, F. validus strong, from valere to be
strong. See Valiant.]
1. Strong; powerful; efficient. [Obs.] "Perhaps more valid arms . . .
may serve to better us." Milton.
2. Having sufficient strength or force; founded in truth; capable of
being justified, defended, or supported; not weak or defective;
sound; good; efficacious; as, a valid argument; a valid objection.
An answer that is open to no valid exception. I. Taylor.
Definition: Having legal strength or force; executed with the proper
formalities; incapable of being rightfully overthrown or set aside;
as, a valid deed; a valid covenant; a valid instrument of any kind; a
valid claim or title; a valid marriage.
– Prevalent; available; efficacious; just; good; weighty;
sufficient; sound; well-grounded.
Source: Webster’s Unabridged Dictionary 1913 Edition