Ma'anar ƙamus na "lamba ta gaske" ita ce:Lamba da za a iya bayyana shi azaman ƙima ko juzu'i kuma yana cikin jerin lambobi masu ma'ana ko marasa ma'ana, gami da lambobi masu kyau da marasa kyau. kuma sifili. Ana kiran lambobi na gaske “na gaske” saboda suna wakiltar adadin da za a iya auna su a zahirin duniya, kamar tsayin igiya, nauyin abu, ko zafin iska. Ana nuna saitin lambobi na ainihi ta alamar ℝ.