Istihsan a zahiri yana nufin amincewa ko yin abin da ya fi dacewa. Asalinsa yana komawa ga kalmar Hasuna, wadda ke nufin kasancewa mai kyau ko mai kyau. A matsayin kalmar ilimin shari'a, ana bayyana Istihsan da cewa shi ne canzawa daga wani Qiyas zuwa wani Qiyas saboda wata hujja, ko dakatar da Qiyas saboda wata hujja. Mujtahid na iya yin la'akari da kowane ɗaya daga cikin waɗannan zaɓuɓɓuka.

Istihsan literally means to approve or to do something preferable. It is a derivation of Hasuna, which means being good or beautiful. As a juristic term, Istihsan is defined as shifting from one Qiyas to another Qiyas due to a reason or suspending a Qiyas for a reason. A Mujtahid may take into consideration any of these options.

A. Istihsan bi-l-Qiyas: barin hukuncin Qiyas zuwa wani hukuncin Qiyas saboda wani dalili mafi karfi.

A. Istihsan by Qiyas- switching from a ruling of Qiyas to another ruling by Qiyas due to a stronger reason.