Ma'anar ƙamus na kalmar "absorbance" ita ce matakin da wani abu ko wani abu ke ɗaukar wani tsayin tsayi ko mitar haske ko wani radiation na lantarki. Yana da ma'auni na adadin hasken da aka ɗauka ta hanyar samfurin, wanda aka bayyana a matsayin logarithm na rabo daga abin da ya faru na wutar lantarki a kan samfurin zuwa wutar lantarki da aka watsa ta hanyar samfurin. Ma’ana, shanyewa shine ma’auni na yawan haske da samfurin ke ɗauka a wani tsayin raƙumi na musamman, kuma ana amfani da shi a cikin spectrophotometry da sauran dabarun nazari don ƙididdige tattarawar abu a cikin mafita.