General Definition:
* Legally or officially acceptable: Something that is valid is recognized as being legally or officially correct and acceptable.
* Example: "The passport is valid for another year."
* Logically sound or well-founded: Something that is valid is based on sound reasoning and evidence.
* Example: "The argument presented a valid point about the consequences of climate change."
* Effective or producing the desired result: Something that is valid is successful in achieving its intended purpose.
* Example: "This is a valid way to solve the problem."
Specific Contexts:
* Logic: In logic, a valid argument is one where the conclusion logically follows from the premises.
* Law: In law, something that is valid is legally recognized and enforceable.
* Science: In science, a valid experiment is one that is designed to test a specific hypothesis and is free from bias.
* Computer science: In computer science, a valid input or data is one that conforms to the expected format and rules.
It's important to consider the context to understand the specific meaning of "valid" in a given situation.