1. having legal force or authority.
2. conforming to fact; accurate.
3. acceptable or allowable.
4. (of an argument or reason) sound; logically correct.
5. (of a person) having attained the legal age for doing something.
6. (of a document or transaction) having legal force or effect.
7. (of a claim or right) legally justified.
8. (of a person) honest or trustworthy.