Legal

 

“Deriving authority from law : founded upon law; conforming to or permitted by law or established rules (as of a game) : according to the principles of law : conforming to the procedures and methods prescribed by law.

 

Source:  Webster’s Third New International Dictionary

 

“Conforming to the law; according to law; required or permitted by law; not forbidden or discountenanced by law; good and effectual in law; of or pertaining to the law; lawful.”

 

Source:  Black’s Law Dictionary, 6^th Edition