Ad"it (#), n. [L. aditus, fr. adire, aitum, to go to; ad + ire to go.]
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.
2.
Admission; approach; access.
[R.]
Yourself and yours shall have
Free adit.
Tennyson.
© Webster 1913.