Ma'anar ƙamus na rabon juzu'i yana nufin alaƙar daidaitawa tsakanin faɗi da tsayin sifar rectangular, kamar allo, hoto, ko bidiyo. Yawanci ana bayyana shi azaman lambobi biyu da aka raba da hanji, inda lamba ta farko ke wakiltar faɗin kuma lamba ta biyu tana wakiltar tsayi. Misali, ma'aunin ma'auni na ma'auni mai faɗin TV shine 16: 9, wanda ke nufin faɗin raka'a 16 ne kuma tsayin raka'a 9 ne. Hakanan za'a iya bayyana ma'auni a matsayin adadi na goma ko kashi, ta hanyar raba faɗin da tsayi. Matsakaicin al'amari muhimmin abin la'akari ne a fagage daban-daban, kamar daukar hoto, fim, da zane-zane, saboda yana shafar abubuwan da aka tsara da kuma hangen nesa na hoton ko bidiyon.