"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 [..]

A nearly horizontal passage from the surface by which a mine is entered and dewatered. A blind horizontal opening into a mountain, with only one entrance.

A horizontal entrance to an underground excavation site.

ADIT is an immigration law term. It is the abbreviation for Alien Documentation, Identification and Telecommunications card, Form I-89. ADIT is used to collect important data regarding an alien. Form [..]

(n) a nearly horizontal passage from the surface into a mine

A short transverse tunnel connecting two parallel main tunnels; often called a "cross adit"

A short length of horizontal or sub-horizontal tunnel driven from the surface to the main tunnel to enable more headings to be driven or to provide permanent access to the tunnel.

A horizontal passage from the surface into a mine. Sometimes called a tunnel.

common mining term for a horizontal to sub–horizontal tunnel driven into a hillside to access an ore body.

A horizontal passage from the surface into a mine. Sometimes called a tunnel.

A horizontal passage connecting the surface and the workings of an underground mine.

An opening driven horizontally into the side of a mountain or hill for providing access to a mineral deposit. Advanced property

a horizontal or nearly horizontal underground passage coming to the surface at one end of a mine.

A tunnel designed to extract materials, such as minerals or coal, from underground, or to drain existing mines by sloping slightly upwards from the entrance. Adits are therefore self-draining.