Webster's English Dictionary

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atomistic

at.om.is.tic \.at-*-'mis-tik\ \-ti-k(*-)le-\ aj 1: of or relating to atoms 
   or atomism  2: composed of many simple elements; also : divided into 
   unconnect ed or antagonistic fragments {an ~ society} - at.om.is.ti.cal.ly 
   av