Webster's English Dictionary

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concentration

con.cen.tra.tion \.ka:n(t)-s*n-'tra--sh*n, -.sen-\ n 1: the act or process 
   of concentrating : the state of being concentrated;  specif : direction of 
   attention on a single object 2: a concentrated mass or thing  3: the 
   relative content of a component : STRENGTH