Lit: One-fifth. Tech: It has come to be known as one-fifth share of the state from the booty. In the early days of Islam, it used to be one of the major sources of public revenue.
Amanah
Dar al-arqam
Arbun
Al-‘ushr
Al-istan
Al-’awraj
Riba
’ahadith al-mu‘amalah
Deployment Ratio
Al-’aqilah