Extramural means occurring outside the walls or boundaries of an institution or organization, or activities conducted outside its main facilities. It is often used to describe programs, competitions, or learning that take place off-site or beyond the internal confines of a school, college, university, or similar entity. It can also refer to activities that involve participants from multiple institutions or groups, rather than being limited to those enrolled at a single entity. Key nuances:

• In education, extramural can describe courses or study that happen off campus, such as distance learning or outreach programs.
• In sports or competitions, extramural refers to events that involve participants from different schools or organizations (inter-school or intercollegiate events).
• In a general sense, extramural denotes anything outside the established internal grounds or walls of an institution.

If you’d like, I can tailor this definition to a specific context (education, sports, business, etc.).