Al-Qiyaas shi ne haɗa wani al'amari da wani al'amari a cikin Hukuncin Shari'a, saboda al'amuran biyu suna da 'Illah (dalili) guda ɗaya, a lokacin da 'Illah ɗin ta zama Ba'ith (dalili/sanadin) na Hukuncin.

Al-Qiyaas is the joining of a matter to another matter within the Hukm Ash-Shar’iy due to the two matters being unified in respect to the (commonly shared) ‘Illah (reasoning) in the case where the ‘Illah represents the Baa’ith (reason/cause) for the Hukm.

Ma'anar tarjahar Qiyaas ita ce a rinjayar da reshen hukunci da aka ɗauka ta hanyar Qiyaas a kan wani hukunci na wannan reshe guda, shi ma wanda aka ɗauka ta hanyar wani Qiyaas daga wata nassi daban.

Outweighing Qiyaas means outweighing a branch Hukm taken by way of Qiyaas upon another Hukm for the same branch also taken by way of another Qiyaas from another text.