n, pl  -ties  1  :  the quantity per unit volume, unit area, or unit length: as  a  :  the mass of a substance per unit volume  b  :  the distribution of a quantity (as mass, electricity, or energy) per unit usu. of space  c  :  the average number of individuals or units per space unit <a population of 500 persons per square mile>   2 a  :  the degree of opacity of a translucent medium  b  :  ABSORBANCE .
 
   
 
Similar sounding terms:  tae·nia·cide  to·nic·i·ty 
 
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