I will believe him as soon as he offers a valid answer.
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. + validity va·lid·ity the validity of making children wear cycle helmets
Justifiable, well grounded, sound; producing the desired results, efficacious; incontestable
In XML, the term used to describe a document that conforms to the rules of the associated schema Go to Validation for more information about valid documents
If a ticket or other document is valid, it can be used and will be accepted by people in authority. All tickets are valid for two months. see also validity
A valid XML document, in addition to being well formed, conforms to all the constraints imposed by a DTD In other words, it does not contain any tags that are not permitted by the DTD, and the order of the tags conforms to the DTD's specifications
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
"Valid" is an ambiguous adjective which is used in two related senses: Of arguments which are necessarily truth-preserving Of argument forms every instance of which are "valid" in sense 1 See "validating" Usually context, namely, whether the subject is an argument or argument form, makes it clear which of these meanings is intended However, sometimes this ambiguity is a boobytrap which leads to confusion For this reason, in the Fallacy Files, I use "valid" only in sense 1, and "validating" for sense 2