A horizontal or nearly horizontal passage from the surface into a mine as contrasted to a shaft which is a vertical entry passage. An adit may be used for ventilation, haulage, drainage, or other purposes.
An approach or entrance; specif., an almost horizontal passageway into a mine.
An almost horizontal entrance to a mine.
Origin of adit
Latin aditusaccessfrompast participle ofadīreto approachad-ad-īreto goei- in Indo-European roots
American Heritage Dictionary of the English Language, 5th Edition