- (British English)
arranged by a university, college, etc. for people who only study part-time 校外的（高等院校为非全日制学生而设的） extramural education/studies/departments 校外教育／学习／课程部
- (formal)
happening or existing outside or separate from a place, an organization, etc. （地方、机构等）之外的，外部的，以外的
Word Originmid 19th cent. (in sense (2)): from Latin extra muros ‘outside the walls’ + -al.