demi-

prefix

"demi" is a 4-letter English headword indexed on PlainSpell.

The verdict

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

Unranked
below top-frequency English
5
letters

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - partial

Corpus desk

Index EN-demi · demi- · English

demi- · unranked · 0 variants · 0 confusables

  • FREQ-UNRANKED Unranked
  • LEN-MID 5 letters
  • VOW-2 2 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-THIN "D" 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 demi-
PropertyValue
Headworddemi-
LanguageEnglish
Part of speechPrefix
Letters5
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “demi-” in English

demi-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

demi- is uncommon English outside the top frequency list, classed as aprefix. Rarity is why readers land here mid-draft. 3 senses are on record.

No misspelling variants are generated for demi- in our index, since its letter pattern doesn't lend itself to common typo substitutions. Our dataset records no confusable match here, since nothing in our dataset looks or sounds close enough to cause mix-ups.

Etymologically, the entry records: From Middle English demi (“half, half-sized, partial”), from Anglo-Norman demi (“half”), from Vulgar Latin *dimedius, from Latin dīmidius, from dis- (“apart; in two”) + medius (“middle”). The correct English form is demi-, spelled D-E-M-I--.

Definition

  1. 1
    partial
  2. 2
    half
  3. 3
    Only the upper or front half of

Recorded use

Wiktionary example

These source excerpts show how demi- appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. The Barony of Pennicuik, the property of Sir George Clerk, Bart., is held by the following singular tenure: The proprietor is bound to sit upon a large rock, called the Buckstone, and wind three blasts of a horn when the king comes to hunt on the Borough Moor near Edinburgh. On account of this singular custom the family have adopted as their crest a demi-…

Etymology

From Middle English demi (“half, half-sized, partial”), from Anglo-Norman demi (“half”), from Vulgar Latin *dimedius, from Latin dīmidius, from dis- (“apart; in two”) + medius (“middle”).

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.

Frequently Asked Questions

How do you spell "demi-"?
"demi-" is spelled D-E-M-I--.
What does "demi-" mean?
As a prefix, "demi-" means: partial
What is the origin of the word "demi-"?
From Middle English demi (“half, half-sized, partial”), from Anglo-Norman demi (“half”), from Vulgar Latin *dimedius, from Latin dīmidius, from dis- (“apart; in two”) + medius (“middle”). 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.

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

Source: FrequencyWords open word-frequency list