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ENGLISH · A WORD WITH POSSIBILITIES

thickness.

The property of being thick (in dimension).

9 characters2 syllables approx.English language

Meaning & usage

noun/ˈθɪknəs/

  1. The property of being thick (in dimension).

    uncountable

  2. A measure of how thick (in dimension) something is.

    countable · uncountable
    The thickness of the Earth's crust varies from two to 70 kilometres.
    Guitar picks come in different thicknesses.

  3. A layer.

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

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

    uncountable
    Whip the cream until it reaches a good thickness.

  5. The property of being thick (slow to understand).

    informal · uncountable

  6. The minimum number of planar subgraphs which a given graph can decompose into.

    countable
Where this word comes from

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”).

verb/ˈθɪknəs/

  1. To trim (wood) to a consistent thickness using a thickness planer.

    transitive
Where this word comes from

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”).

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.