the state or quality of being thick.
the measure of the smallest dimension of a solid figure: a board of two-inch thickness.
the thick part or body of something: the thickness of the leg.
a layer, stratum, or ply: three thicknesses of cloth.
verb (used with object)
to bring (a piece, as a board) to a uniform thickness.

before 900; Middle English thiknesse, Old English thicnes. See thick, -ness Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thickness (ˈθɪknɪs)
1.  the state or quality of being thick
2.  the dimension through an object, as opposed to length or width
3.  a layer of something
4.  a thick part

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

thickness thick·ness (thĭk'nĭs)

  1. The quality or condition of being thick.

  2. The dimension between two surfaces of an object, usually the one of smallest measure.

  3. A layer or stratum.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Rake them into a layer of even thickness and run over them with the lawnmower.
But the layers can be alternated to any thickness desired, and inconvenient
  antigens thus hidden from view.
The number of pins raised reflects the thickness of the line.
Glaciers are shrinking not only in area but also in thickness.
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