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concentration 
  n 
1 intense mental application; complete attention 
2 the act or process of concentrating 
3 something that is concentrated 
4 the strength of a solution, esp. the amount of dissolved substance in a given volume of solvent, usually expressed in moles per cubic metre or cubic decimetre (litre)., (Symbol)  c 
5 the process of increasing the concentration of a solution 
6  (Military) 
a the act of bringing together military forces 
b the application of fire from a number of weapons against a target 
7  (Economics) the degree to which the output or employment in an industry is accounted for by only a few firms 
8  another name (esp. U.S.) for  →  Pelmanism 

concentration camp 
  n a guarded prison camp in which nonmilitary prisoners are held, esp. one of those in Nazi Germany in which millions were exterminated 



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