valid

valid [val′id]

adj.

[Fr valide < L validus, strong, powerful (in ML, valid) < valere, to be strong: see VALUE]

1. having legal force; properly executed and binding under the law

2. well-grounded on principles or evidence; able to withstand criticism or objection, as an argument; sound

3. effective, effectual, cogent, etc.

4. Rare robust; strong; healthy

5. Logic correctly derived or inferred according to the rules of logic

validly

adv.

validness

n.

SYN.- VALID applies to that which cannot be objected to because it conforms to law, logic, the facts, etc. [a valid criticism ]; SOUND² refers to that which is firmly grounded on facts, evidence, logic, etc. and is therefore free from error [a sound method ]; COGENT implies such a powerful appeal to the mind as to appear conclusive [cogent reasoning ]; CONVINCING implies such validity as to persuade or overcome doubts or opposition [a convincing argument ]; TELLING suggests the power to have the required effect by being forcible, striking, relevant, etc. [a telling rejoinder ] -ANT. FALLACIOUS