Origin: Germanic Old English suffix
Thickness has 5 different meanings across 1 category:
the dimension through an object as opposed to its length or width
"The thickness of the book made it difficult to carry in my pocket."
indistinct articulation
"judging from the thickness of his speech he had been drinking heavily"
resistance to flow
"The high thickness of the honey made it difficult to pour from the jar."
The property of being thick (in dimension).
"The thickness of the wool coat kept him warm during the winter storm."
In plain English: Thickness is how much space something takes up from its front to back side, making it feel bulky rather than flat.
"The thickness of the winter coat kept me warm all day long."
Usage: Thickness refers to the measurement from one side or surface of an object to its opposite, distinct from width or depth in three-dimensional contexts. Use this term when describing how substantial something is rather than simply stating that it has a large size.
The word thickness comes from the Old English þicnesse, which originally described physical qualities like viscosity and hardness as well as abstract ideas such as darkness or a thicket. It entered modern usage directly from this ancient Germanic root without needing to replace other borrowed terms for the same concept.