The meaning of VALID is having legal efficacy or force; especially : executed with the proper legal authority and formalities. How to use valid in a sentence. Synonym Discussion of Valid.

VALID definition: 1. based on truth or reason; able to be accepted: 2. A ticket or other document is valid if it is…. Learn more.

Valid definition: sound; just; well-founded.. See examples of VALID used in a sentence.

Something that is valid is important or serious enough to make it worth saying or doing. Most designers share the unspoken belief that fashion is a valid form of visual art.

These adjectives describe assertions, arguments, conclusions, reasons, or intellectual processes that are persuasive because they are well founded. What is valid is based on or borne out by …

Definition of valid adjective from the Oxford Advanced Learner's Dictionary. that is legally or officially acceptable. Do you have a valid passport? He bought a bus pass valid for one month. …

(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 …

Oct 19, 2025 · An argument is valid if and only if the set consisting of both (1) all of its premises and (2) the contradictory of its conclusion is inconsistent.

There are nine meanings listed in OED's entry for the adjective valid, one of which is labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

• All of those criticisms are valid. • The government still hasn't produced a valid argument in favour of its policies on immigration. • But at this point, no valid comparison can be made between …