a. 1. Being within the walls, as of a city. [ 1913 Webster ]
2.Hence: Of or pertaining to those activities occurring within a single institution or organization, such as intramural sports involving students of a single school; an intramural debate within a professional society. [ PJC ]
3. (Anat. & Med.) Being within the substance of the walls of an organ; as, intramural pregnancy. [ 1913 Webster ]