Ma'anar ƙamus na kalmar "adit" hanya ce ta kwance ko rami da ke kaiwa cikin mahakar ma'adanan don manufar shiga, samun iska, ko magudanar ruwa. Hakanan yana iya komawa zuwa ƙofar da ke kusa da kwance ko ratsawa cikin ma'adanan don hakar gawayi ko wasu ma'adanai. A fannin ilmin kasa, adit kuma na iya zama wani wuri kusan a kwance a cikin samuwar dutse, kamar kogo ko dutse, da zaizayar kasa ko wasu hanyoyin halitta suka yi.