Webster's English Dictionary

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thickness

thick.ness \-n*s\ n 1: the quality or state of being thick  2: the smallest 
   of three dimensions {length, width, and ~}  3a: viscous consistency  3b: 
   the condition of being smoky, foul, or foggy  4: the thick part of 
   something  5: CONCENTRATION, DENSITY  6: DULLNESS, STUPIDITY  7: LAYER, 
   PLY, SHEET {a single ~ of canvas}