•The lexical meaning of Asl (plural Usul):Something from which another thingoriginates [Root].
•It also means, Something upon whichanother thing is constructed [Foundation].
•In some cases asl is used in the sense of theword ‘Masdar’, which means [Source].
•In the legal system of Islam, Fiqh is builtupon and stems from the bases (Usul),which constitute its source-evidence.