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ENGLISH · A WORD WITH POSSIBILITIES

inclusion.

An addition or annex to a group, set, or total.

9 characters3 syllables approx.English language

Meaning & usage

noun/ɪnˈkluːʒən/

  1. An addition or annex to a group, set, or total.

    countable
    The poem was a new inclusion in the textbook.

  2. The act of including, i.e. adding or annexing, (something) to a group, set, or total.

    uncountable
    The inclusion of the poem added value to the course.

  3. Anything foreign that is included in a material.

    countable

  4. Any material that is trapped inside a mineral during its formation, as a defect in a precious stone.

    countable

  5. A nuclear or cytoplasmic aggregate of stainable substances.

    countable · uncountable

  6. An object completely inside a tissue, such as epidermal inclusion cyst, a cyst in the epidermis.

    countable · uncountable

  7. A mapping where the domain is a subset of the image.

    countable · uncountable

  8. Restriction; limitation.

    countable · obsolete · uncountable
Where this word comes from

Etymology tree Proto-Indo-European *h₁én Proto-Italic *en Proto-Italic *en- Latin in- Proto-Indo-European *kleh₂w-der. Proto-Italic *klaudō Latin claudō Latin inclūdō Proto-Indo-European *-tis Proto-Indo-European *-Hō Proto-Indo-European *-tiHō Proto-Italic *-tiō Latin -tiō Latin inclūsiōbor. English inclusion Borrowed from Latin inclūsiō, inclūsiōnis, from the verb Latin inclūdō (“to shut in, enclose, insert”), from in- (“in”) + claudō (“to shut”), ultimately from Proto-Indo-European *kleh₂w- (“key, hook, nail”). By surface analysis, include + -sion. Doublet of enclosure.

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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.