-ism

/-ɪzəm/

//-ɪzəm// suffix

"ism" is a 3-letter English headword indexed on PlainSpell.

The verdict

“-ism” is uncommon English (outside the top frequency list), classed as a suffix. The kind of spelling people second-guess.

Unranked
below top-frequency English
4
letters

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Used to form nouns of action, process, or result based on the accompanying verb ending in -ise or -ize.

Corpus desk

Index EN-ism · -ism · English

-ism · unranked · 0 variants · 0 confusables

  • FREQ-UNRANKED Unranked
  • LEN-MID 4 letters
  • VOW-1 1 vowel
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-THIN "-" thin
  • PHOTO-UNK Peer pending

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Key facts for -ism
PropertyValue
Headword-ism
LanguageEnglish
Part of speechSuffix
IPA/-ɪzəm/
Letters4
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Where “-ism” sits in English frequency

-ism falls outside the top-100,000 ranked English words, the long-tail zone of technical, archaic, or low-frequency vocabulary, exactly where readers second-guess spellings most.

Beyond rank #100,000. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

-ism is uncommon English outside the top frequency list, classed as asuffix, transcribed /-ɪzəm/. Rarity is why readers land here mid-draft. 6 senses are on record.

We couldn't generate a plausible misspelling set for -ism, since its letter sequence doesn't invite the usual edit-distance slips. This entry stands alone in our confusable dataset, which usually means its spelling is distinct enough that readers don't reach for a similar-looking word instead.

Etymologically, the entry records: Etymology tree Proto-Indo-European *-id- Proto-Indo-European *-yéti Proto-Indo-European *-idyéti Proto-Hellenic *-íďďō Ancient Greek -ῐ́ζω (-ĭ́zō) Proto-Indo-European *-mos Proto-Indo-European *-mós Ancient Greek -μός (-mós) Ancient Greek -ισμός (-ismós)der… The correct English form is -ism, spelled --I-S-M.

Definition

  1. 1
    Used to form nouns of action, process, or result based on the accompanying verb ending in -ise or -ize.
  2. 2
    Used to form the name of a school of thought, system, or theory based on the name of its subject or object or alternatively on the name of its founder (When de-capitalized, these overlap with the generic "doctrines" sense below, e.g. Liberalism vs. liberalism.)
  3. 3
    Used to form names of a tendency of action, behaviour, condition, opinion, or state belonging to a class or group of persons, or the result of a doctrine, ideology, or principle or lack thereof.
  4. 4
    Used to form countable nouns indicating a peculiarity or characteristic of language
  5. 5
    Used to form names of ideologies expressing belief in the superiority of a certain class within the concept expressed by the root word, or a pattern of behavior or a social norm that benefits members of the group indicated by the root word. (Based on a late 20th-century narrowing of the "terms for a doctrine" sense.)
  6. 6
    Used to form names of conditions (syndromes, diseases, disorders, defects, addictions) and therapeutical methods or doctrines.

Etymology

Etymology tree Proto-Indo-European *-id- Proto-Indo-European *-yéti Proto-Indo-European *-idyéti Proto-Hellenic *-íďďō Ancient Greek -ῐ́ζω (-ĭ́zō) Proto-Indo-European *-mos Proto-Indo-European *-mós Ancient Greek -μός (-mós) Ancient Greek -ισμός (-ismós)der. English -ism Ultimately from Ancient Greek -ισμός (-ismós), a suffix that forms abstract nouns of action, state, condition, doctrine, from stem of verbs in -ίζειν (-ízein) (whence English -ize). Doublet of -ismus. Many English nouns in -ism are loans of Greek nouns in -ισμός (-ismós), often via Latin and French, such as Judaism, a learned English formation from Latin attested from c. 1500 and ultimately from Ancient Greek Ἰουδαϊσμός (Ioudaïsmós). In Late Latin, the -ismus suffix became the ordinary ending for names of religions and ecclesiastical or philosophical systems or schools of thought, thus chrīstiānismus (whence 16th c. Christianism) in Tertullian, a trend continued in Medieval Latin, with e.g. pāgānismus attested by the 8th century. From the 16th century, such formations became very common in English, until the early 18th century mostly restricted to either root words of Greek or Latin origin (heroism, patriotism) or proper names (Calvinism, Lutheranism). Productivity from root words with evidently non-Latin and non-Greek origin dates to the late 18th century (e.g. blackguardism). Reflecting this productivity, use of ism as a standalone noun is attested in Edward Pettit (1680) and becomes common from the mid-18th century. The narrowed sense of forming terms for ideologies based on the belief of superiority is based on coinages such as racism (1932) or sexism (1936) and productive since the 1970s.

This word in other languages

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA). See the methodology for how each field is sourced and updated.

PlainSpell is rendered directly from structured Wiktionary extracts and open word-frequency lists, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 6, 2026. Primary sources: Wiktionary (via kaikki.org) and FrequencyWords.

Frequently Asked Questions

How do you spell "-ism"?
"-ism" is spelled --I-S-M. The IPA pronunciation is /-ɪzəm/.
What does "-ism" mean?
As a suffix, "-ism" means: Used to form nouns of action, process, or result based on the accompanying verb ending in -ise or -ize.
How do you pronounce "-ism"?
The IPA (International Phonetic Alphabet) transcription for "-ism" is /-ɪzəm/. 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 "-ism"?
Etymology tree Proto-Indo-European *-id- Proto-Indo-European *-yéti Proto-Indo-European *-idyéti Proto-Hellenic *-íďďō Ancient Greek -ῐ́ζω (-ĭ́zō) Proto-Indo-European *-mos Proto-Indo-European *-mós Ancient Greek -μός (-mós) Ancient Greek -ισμός (... 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.
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