valid
Definitions
Having a sound basis in logic or fact; reasonable or cogent.
Legally or officially acceptable or binding.
Correctly derived or inferred according to the rules of logic.
Examples
Please ensure that your passport is valid for at least six months before traveling.
The scientist argued that his hypothesis was based on valid empirical evidence.
You must provide a valid email address to complete the registration process.
Synonyms
legitimate sound logical justified authentic cogent well-founded