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an entrance or a passage.
Also called entry. Mining. a nearly horizontal passage leading into a mine.
an approach or access.
Historical Examples

Clear away obstacles and open the adit to profitable working?
The Great Miss Driver Anthony Hope

Not likely; but we can get down to the water and go along the adit.
Menhardoc George Manville Fenn

He knew a little about mining, since he had on one or two occasions earned a few dollars assisting in the driving of an adit.
A Damaged Reputation Harold Bindloss

A few minutes sufficed to bring them to the beach at the mouth of the adit.
Deep Down, a Tale of the Cornish Mines R.M. Ballantyne

It is a well-established fact that it is much cheaper to drive an adit than to sink a shaft of equal transporting capacity.
The Business of Mining Arthur J. Hoskin

Note; an adit is a horizontal shaft driven in from the cliff.
Sappers and Miners George Manville Fenn

“Why there must be an adit,” cried Hardock, in a tone full of wonder.
Sappers and Miners George Manville Fenn

He doesn’t know the difference between an adit and an air-drill.
Rimrock Trail J. Allan Dunn

But since we are here, with half-an-hour to spare before sunset, what do you say to showing me the adit?
Major Vigoureux A. T. Quiller-Couch

The adit of the mine was at the apex of the hill, which drooped off to the north.
The Memoirs of General W. T. Sherman, Complete William T. Sherman

noun
an almost horizontal shaft into a mine, for access or drainage
n.

“entrance,” c.1600, from Latin aditus “approach, entrance, a going to or drawing near,” from past participle stem of adire “to approach,” from ad- “to” (see ad-) + ire “to go,” from PIE root *ei- “to go” (see ion).