01 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…
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1.
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. Also: drift, tunnel
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2.
Admission; approach; access.[R.]“Yourself and yours shall have Free adit.” — Tennyson.