Ma'anar ƙamus na kalmar "isostasy" ita ce ma'auni na ɓawon ƙasa, inda ƙananan ɓangarorin ɓawon burodi ke goyan bayan rigar da ke ƙasa. Wannan yanayin ma'auni ana kiyaye shi ta hanyar motsin abu a tsaye a cikin lithosphere na duniya don amsa canje-canje a cikin yawan rarraba sama ko ƙasa. Isostasy kalma ce da aka saba amfani da ita a fannin ilimin geology da geophysics don bayyana ma'auni ko daidaita ɓangarorin duniya don mayar da martani ga canje-canjen nauyin da ke kanta, kamar nauyin zanen ƙanƙara ko ɓoye na sediments.