What part of speech is valid?

"Valid" can be several parts of speech depending on how it's used in a sentence:

* Adjective: Describing something as being sound, true, or acceptable.

* Example: "That is a valid argument."

* Noun: A thing that is sound, true, or acceptable.

* Example: "The court determined that the evidence was a valid."

* Verb: To confirm or prove something as sound or true.

* Example: "The judge validated the witness's testimony."

It's important to consider the context to determine the correct part of speech.