Located or occurring outside the walls of a city or institution; involving activities outside the main campus or organization.
From Latin 'extra' (outside) + 'muralis' (relating to walls, from 'murus' wall). Historically applied to areas beyond city walls, now commonly used in academic and institutional contexts.
College 'extramural' sports exist because universities realized students needed to play without wearing the school colors—it created space for fun outside the official hierarchy. Same word, but it freed people from having to represent anything except themselves.
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