1. (n.) An entrance or passage. Specifically: The nearly horizontal opening by which a mine is entered, or by which water and ores are carried away; -- called also drift and tunnel.

2. (n.) Admission; approach; access.

access admission admittance air lock approach channel conduit corridor course ditch duct egress entrance entranceway entree entry entryway exit gangplank gangway hall in ingress inlet intake means of access opening passage passageway trench trough troughing troughway tunnel vestibule way way in