extramural vs outdoor

extramural

adj
  • Taking place outside the walls of an institution, especially a school or university. 

  • Describing teaching of students who are not resident at such an institution. 

outdoor

adj
  • Pertaining to charity administered or received away from, or independently from, a workhouse or other institution. 

  • Situated in, designed to be used in, or carried on in the open air. 

verb
  • To publicly display a child after it has been named 

How often have the words extramural and outdoor occurred in a corpus of books? (source: Google Ngram Viewer )