Ma'anar ƙamus na kalmar "lambar fihirisa" tana nufin ma'aunin ƙididdiga wanda ke ba da kwatancen ƙididdiga tsakanin ƙimar ma'auni a lokuta daban-daban ko a wurare daban-daban. A wasu kalmomi, lambar fihirisa ma'aunin ƙididdiga ce da ke wakiltar canjin dangi a cikin wani madaidaicin lokaci ko a cikin yankuna daban-daban. alamomi, kamar farashin hannun jari, hauhawar farashin kayayyaki, ko kashewar mabukaci. Hakanan ana amfani da su a cikin ilimin zamantakewa, kamar ilimi ko kiwon lafiya, don auna canje-canje a fannoni daban-daban na jin daɗin ɗan adam a tsawon lokaci. ana amfani da su don yin kwatanta tsakanin lokuta ko yankuna daban-daban. Ana iya gina su ta amfani da hanyoyi daban-daban, irin su Laspeyres, Paasche, ko Fisher formula, dangane da manufa da halayen bayanan.