Adit

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.