Webster's English Dictionary

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density

den.si.ty \'den(t)-s*t-e-\ n 1: the quality or state of being dense  2: the 
   quantity per unit volume, unit area, or unit length : as  2a: the mass of a 
   substance per unit volume  2b: the average number of individuals or units 
   per space unit  3: STUPIDITY  4a: the degree of opacity of a translucent 
   medium  4b: the common logarithm of the opacity