## Meanings
1. How thick something is; the distance between its two opposite surfaces.
2. How thick a liquid or substance is; its consistency.
3. A single layer of something.

## Examples
- The thickness of the ice was about ten centimetres.
- Whip the cream until it reaches the right thickness.
- They added three thicknesses of cloth for extra comfort.

## Synonyms
- denseness
- slowness
- stupidity
- thickheadedness

## Antonyms
- fluidity
- liquidity
- quick-wittedness
- runniness
- sharpness
- thinness
- wateriness

## Roots and Affixes
- Root: thikkenesse
- Root: þicnes
- Root: *þikkwīnassī

## Etymology
From Middle English thikkenesse, thiknesse, from Old English þicnes (“thickness, viscosity, density, hardness; obscurity, cloud, darkness; thicket; depth, a thick body, anything thick or heavy”), from Proto-West Germanic *þikkwīnassī (“thickness”), equivalent to thick + -ness. Cognate with West Frisian tsjokkens (“thickness”), Old High German dickinessī, dikkinissi, diknissi (“thickness, density”). Eclipsed non-native Middle English crassitude (“thickness”) from Latin crassitūdō (“thickness”).

## AI Etymology
Thickness is from Middle English thikkenesse, thiknesse, from Old English þicnes (“thickness, viscosity, density, hardness; obscurity, cloud, darkness; thicket; depth, a thick body, anything thick or heavy”), from Proto-West Germanic *þikkwīnassī (“thickness”), equivalent to thick + -ness. Cognate with West Frisian tsjokkens (“thickness”), Old High German dickinessī, dikkinissi, diknissi (“thickness, density”). Eclipsed non-native Middle English crassitude (“thickness”) from Latin crassitūdō (“thickness”).

## Topics
- Space, Position & Direction
- Materials & Substances

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