inclusion

/ɪnˈkluːʒən/

//ɪnˈkluːʒən// noun

By · According to Wiktionary data (CC BY-SA) ·

"inclusion" is a 9-letter English headword indexed on PlainSpell.

The verdict

“inclusion” is a regularly-used English word, ranked #6,921 in English word frequency and used as a noun.

#6,921
frequency rank, English
9
letters
14
tracked misspellings
6
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - An addition or annex to a group, set, or total.

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

inclusion vs infusion
78% similar
inclusion vs inclusive
78% similar
inclusion vs intrusion
78% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for inclusion
PropertyValue
Headwordinclusion
LanguageEnglish
Part of speechNoun
IPA/ɪnˈkluːʒən/
Letters9
Frequency rank#6,921
Misspellings tracked14
Confusable pairs6
SourceWiktionary (kaikki.org)

Where “inclusion” sits in English frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). inclusion lands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Spelling & Dictionary Insight

The English entry for inclusion is 9 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /ɪnˈkluːʒən/. Corpus data places it at rank #6,921 in overall English word frequency, indicating it appears regularly in written and spoken text. Wiktionary records 8 distinct senses for this headword, so context determines which meaning a reader should apply.

Our generated misspelling index lists 14 likely wrong-spelling variants for inclusion, with forms such as "icnlusion", "incclusion", and "incllusion". Every one of these variants traces to a single-character edit -- an added or dropped letter, a swapped consonant, or a vowel swap -- the kind of slip a spell-checker is built to catch. It also participates in 6 confusable-pair relationships, "infusion", "inclusive", "intrusion", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.

Etymologically, the entry records: Borrowed from Latin inclusio, inclusionis, from the verb Latin inclūdō (“to shut in, enclose, insert”), from in- (“in”) + claudō (“to shut”), ultimately from Proto-Indo-European *kleh₂u- (“key, hook, nail”). By surface analysis, include + -sion. Doublet of … The correct English form is inclusion, spelled I-N-C-L-U-S-I-O-N.

Definition

  1. 1
    An addition or annex to a group, set, or total.
  2. 2
    The act of including, i.e. adding or annexing, (something) to a group, set, or total.
  3. 3
    Anything foreign that is included in a material.
  4. 4
    Any material that is trapped inside a mineral during its formation, as a defect in a precious stone.
  5. 5
    A nuclear or cytoplasmic aggregate of stainable substances.
  6. 6
    An object completely inside a tissue, such as epidermal inclusion cyst, a cyst in the epidermis.
  7. 7
    A mapping where the domain is a subset of the image.
  8. 8
    Restriction; limitation.

Etymology

Borrowed from Latin inclusio, inclusionis, from the verb Latin inclūdō (“to shut in, enclose, insert”), from in- (“in”) + claudō (“to shut”), ultimately from Proto-Indo-European *kleh₂u- (“key, hook, nail”). By surface analysis, include + -sion. Doublet of enclosure.

Antonyms

exclusion

This word in other languages

inclusión(Español)inclusion(Français)inclusão(Português)

Common misspellings

Also misspelled as: icnlusion,incclusion,incllusion,inclsuion,incluison,inclusino,inclusionn,inclusoin,inclussion,inclution,inculsion,inlcusion,innclusion,niclusion

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of inclusion - expressed in single-character edits (insert, delete, or swap one letter). Bigger bars stand out at a glance; a one-edit slip is the hardest to catch.

icnlusion2incclusion1incllusion1inclsuion2incluison2inclusino2inclusionn1inclusoin2
Edit distance from "inclusion"

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "inclusion"?
"inclusion" is spelled I-N-C-L-U-S-I-O-N. The IPA pronunciation is /ɪnˈkluːʒən/.
What does "inclusion" mean?
As a noun, "inclusion" means: An addition or annex to a group, set, or total.
What words are commonly confused with "inclusion"?
"inclusion" is commonly confused with "infusion", "inclusive", "intrusion". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "inclusion"?
The IPA (International Phonetic Alphabet) transcription for "inclusion" is /ɪnˈkluːʒən/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "inclusion"?
Borrowed from Latin inclusio, inclusionis, from the verb Latin inclūdō (“to shut in, enclose, insert”), from in- (“in”) + claudō (“to shut”), ultimately from Proto-Indo-European *kleh₂u- (“key, hook, nail”). By surface analysis, include + -sion. D... See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Using “inclusion”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is I-N-C-L-U-S-I-O-N - every other letter order is a misspelling in standard orthography.
  • Say it as /ɪnˈkluːʒən/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
  • Don't mix it up with “infusion” - see the side-by-side comparison. inclusion vs infusion
  • Browse more English words and confusable pairs in the same reference. English words
Data Source

Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list