[ thik-nis ]
/ ˈθɪk nɪs /


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.

Nearby words

  1. thickheaded,
  2. thickheadedly,
  3. thickie,
  4. thickleaf,
  5. thickly,
  6. thickness piece,
  7. thicko,
  8. thickset,
  9. thief,
  10. thief ant

Origin of thickness

before 900; Middle English thiknesse, Old English thicnes. See thick, -ness Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for thickness

British Dictionary definitions for thickness


/ (ˈθɪknɪs) /


the state or quality of being thick
the dimension through an object, as opposed to length or width
a layer of something
a thick part
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for thickness



Old English þicness; see thick + -ness.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for thickness


[ thĭknĭs ]


The quality or condition of being thick.
The dimension between two surfaces of an object, usually the one of smallest measure.
A layer or stratum.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.