valid

The word “valid” means based on sound reasoning; well-founded and hard to argue against. In plain terms, correct, sound, or officially acceptable — whether that's an argument, a ticket, or an ID.

“Valid” is pronounced VA-lihd (/ˈvælɪd/ in IPA).

Here is “valid” used in a sentence: “She raised a valid concern about the budget.”

Words with a similar meaning to “valid” include acceptable, allowable, legit, legitimate, leveful and licit.

The opposite of “valid” — its antonyms — are invalid, nonvalid, disallowed, illegitimate and illicit.

“Valid” is an adjective.

The word “valid” comes from Latin. From Latin validus, "strong", from valere, "to be strong or worth something".

“Valid” is a fairly common word in modern English, usually learned at around the B2 level.

Valid means meeting the required conditions or being based on sound reasoning, as in "a valid passport" or "a valid argument." Legitimate means conforming to the law or to accepted standards, and often carries a sense of rightful authority, as in "a legitimate claim." A document is usually described as valid, while a claim to power or ownership is described as legitimate.

In formal logic, an argument is valid when the conclusion follows logically from the premises, even if those premises happen to be false. A sound argument is one that is valid and also has true premises. So every sound argument is valid, but a valid argument is not necessarily sound.

The correct negative form is invalid, as in "an invalid ticket" or "an invalid argument." Unvalid is not standard English. Note that the adjective invalid (not acceptable) is spelled the same as the noun invalid (a person weakened by illness) but is a different use of the word.

Valid frequently pairs with point, reason, argument, and concern in the reasoning sense: "she raised a valid point." In the official sense it pairs with passport, ticket, licence, and contract: "the visa is valid for six months." Saying something "remains valid" or is "no longer valid" is also very common.