Probably from Middle English lete (“a meeting or intersection of roads; junction; crossroads; conduit”), from Old English ġelǣte (“a going out, ending, meeting”), as in Old English wæterġelǣt (“watercourse, aquaduct”), from Proto-Germanic *lētą, *galētą (“a letting, a letting out”). Cognate with Old High German gilāz (“outlet, exit, end, road junction”), German Gelaß (“back room, recess, private chamber”). Related to English let.