Mesos is the Greek adjective meaning 'middle' or 'in the midst,' used substantively with the article to indicate the central point of a place, gathering, or circumstance. Jesus sends his disciples 'as sheep into the midst of wolves' (Matt 10:16), sets a child 'in the midst' of the Twelve (Matt 18:2), and promises to be present 'where two or three are gathered' — literally, 'in the midst of them' (Matt 18:20). The word also marks temporal midpoints ('about the middle of the feast,' John 7:14) and serves in dramatic narrative moments like Paul standing 'in the middle of the Areopagus' (Acts 17:22). German Mitte, French milieu, and Spanish medio all converge on a single spatial-center meaning, though each occasionally extends to social contexts just as the Greek does.