ADIT, noun [Latin aditus, from adeo, aditum, to approach, ad and eo, to go.] An entrance or passage; a term in mining, used to denote the opening by which a mine is entered, or by which water and ores are carried away. It is usually made in the side of a hill. The word is sometimes used for aid-shaft, but not with strict propriety.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI