adj 1  :  having characters or a mode of inheritance dependent on a number of genes at different loci  2  or  mul*ti*fac*tor   :  having, involving, or produced by a variety of elements or causes <a study>  <a disease with a etiology>  mul*ti*fac*to*ri*al*ly adv mul*ti*fac*to*ri*al*i*ty n pl  -ties  
 
   
 
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