Ma'anar ƙamus na kalmar "equilateral" sifa ce da ke bayyana siffa ko siffa inda dukkan bangarorin suke da tsayi daidai. Ana amfani da wannan kalmar don kwatanta triangles, inda dukkanin bangarorin uku suke da tsayi ɗaya, suna ƙirƙirar siffa mai kusurwa uku daidai da digiri 60 kowanne. Kalmar "equilateral" ta fito ne daga kalmar Latin "aequus," wanda ke nufin "daidai," da "latus," wanda ke nufin "gefe."