From Middle English thikkenesse, thiknesse, from Old English þicnes, from Proto-West Germanic *þikkwīnassī, equivalent to .

• IPA: /ˈθɪknəs/

thickness

1. (uncountable) The property of being thick (in dimension).
2. (uncountable, countable) A measure of how thick (in dimension) something is.

   The thickness of the Earth's crust varies from two to 70 kilometres.

   Guitar picks come in different thicknesses.

3. (countable) A layer.

   We upholstered the seat with three thicknesses of cloth to make it more comfortable to sit on.

4. (uncountable) The quality of being thick (in consistency).

   Whip the cream until it reaches a good thickness.

5. (uncountable, informal) The property of being thick (slow to understand).
6. (graph theory, countable) The minimum number of planar subgraphs which a given graph can decompose into.

• (the property of being thick in dimension) fatness
• (measure) depth
• (layer) layer, stratum
• (in consistency) density, viscosity
• (property of being stupid) denseness, slowness, stupidity, thickheadedness

• (antonym(s) of “in consistency”): fluidity, liquidity, runniness, thinness, wateriness
• (antonym(s) of “property of being stupid”): mental acuity, mental agility, quick-wittedness, sharpness

• French: épaisseur, grosseur
• German: Dicke
• Italian: spessore, grossezza
• Portuguese: grossura, espessura
• Russian: толщина́
• Spanish: grosor, espesura

• French: épaisseur
• German: Dicke
• Russian: толщина́
• Spanish: grosor

• German: Dicke
• Russian: густота́

• Spanish: torpeza

thickness (thicknesses, present participle thicknessing; simple past and past participle thicknessed)

1. (transitive) To trim (wood) to a consistent thickness using a thickness planer.
   • 2003, Garrett Hack, The Handplane Book, page 143:

     Even if the parts are thicknessed by machine, check for and plane out any cup with a bench plane.