‖adat|ˈadat|Also 8 addat.[Malay,f.Arab.‭ﻋāda custom, customary law.]In the Islamic regions ofS.E.Asia: custom, or customary law, particularly in contrast to Islamic religious law. Freq. attrib., as adat law.1783W. MarsdenHist.Sumatra 178That does not affect their addat or customs.1839T. J. NewboldStraits of Malacca II xiv. 265Such is the adat.1906A. W. S. O'Sullivantr.Snouck Hurgronje's Achehnese I. i. 77There are..individual cases which are controlled by an adat of native growth.1927Jrnl.Compar.Legislation IX. 149 (heading)Indonesian adat law.1964Wang GungwuMalaysia 15The majority of people shared..similar sets of customs and adat law.1978M. B. HookerConc.LegalHist.S.-E. Asia v. 149The conflict between adat and Islam occurs in all the states of Malaysia and is essentially concerned with the distribution of property arising out of death or divorce.