(adj) carried on within the bounds of an institution or community, Ant. extramural, Example:most of the students participated actively in the college's intramural sports program
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
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 ]