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

1595–1605; < Latin aditus an approach, equivalent to ad- ad- + -i- (stem of īre to go) + -tus suffix of v. action Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
adit (ˈædɪt)
an almost horizontal shaft into a mine, for access or drainage
[C17: from Latin aditus an approach, from adīre, from ad- towards + īre to go]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"entrance," c.1600, from L. aditus "approach, entrance," from pp. stem of adire "to approach," from ad- "to" + ire "to go," from PIE base *ei- "to go" (see ion).
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica


a horizontal or near-horizontal passage driven from the Earth's surface into the side of a ridge or mountain for the purpose of working, ventilating, or removing water from a mine.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
From the adit two incline raises were excavated to the surface.
The adit would be excavated back to competent material and a cement bulkhead would be constructed to seal off the entrance.
The gate on the lower adit is still in place and functioning, but the gate on the upper adit is in need of complete replacement.
The first, main adit appears to have been used as both a workshop and sleeping area.
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