vb, -trat*ed  -trat*ing vt  1 a  :  to bring or direct toward a common center or objective  :  FOCUS  b  :  to accumulate (a toxic substance) in bodily tissues <fish mercury>   2  :  to make less dilute < syrup>  vi  :  to fix one's powers, efforts, or attention on one thing < on a problem>  con*cen*tra*tor n 
, n :  something prepared by concentration : esp  :  a food reduced in bulk by elimination of fluid <orange juice >  .
 
   
 
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