semi

/ˈsɛmi/

//ˈsɛmi// noun

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

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

The verdict

“semi” has 5 generated spelling variants in the English index at frequency #2,965. The variants make it a useful spelling check.

#2,965
frequency rank, English
6,566
“S” headwords
5
tracked misspellings
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - A semi-detached house.

Corpus desk

Index EN-semi · semi · English

semi · rank #2,965 · 5 variants · 20 confusables

  • FREQ-COMMON #2,965
  • LEN-MID 4 letters
  • VOW-2 2 vowels
  • CONFUS-HIGH 20 pairs
  • VAR-MID 5 variants
  • BOOK-DENSE 6,566
  • PHOTO-FINISH recording

Nearest frequency peer: recording (-1 rank slots)

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.

Rank peers near misspelling magnet “semi”

Same rarity band: useful when a typo lands on a peer headword

corpus weight

What this shows “semi” sits among these FrequencyWords peers; misspelling depth is tracked separately in the edit-distance chart.

Source FrequencyWords open word-frequency list As of September 3, 2026

Visual similarity to commonly confused words

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

semi vs SI
0% similar
semi vs SM
0% similar
semi vs set
50% similar

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

Key facts for semi
PropertyValue
Headwordsemi
LanguageEnglish
Part of speechNoun
IPA/ˈsɛmi/
Letters4
Frequency rank#2,965
Misspellings tracked5
Confusable pairs20
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “semi”

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

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

Ticks step logarithmically, so each one marks a roughly tenfold drop in how often the word turns up. Same rarity band neighbours include “recording” (#2,964), “statements” (#2,966), “quote” (#2,963). Among 6,566 “S” headwords, “semi” is #2,965. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 5 spelling variants around semi (IPA /ˈsɛmi/), anoun. Corpus frequency is #2,965 among 6,566 “S” headwords. Wiktionary lists 7 senses, so context still picks the gloss.

Our generated misspelling index lists 5 likely wrong-spelling variants for semi, with forms such as "esmi", "seim", and "semmi". 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 20 confusable-pair relationships, "SI", "SM", "set", and more, a pairing that trips writers up because the two words share enough sound or shape to blur together.

Etymologically, the entry records: The prefix semi- (from Latin) used as a noun. The correct English form is semi, spelled S-E-M-I.

Definition

  1. 1
    A semi-detached house.
  2. 2
    A semi-trailer; a tractor-trailer; an eighteen-wheeler; an artic.
  3. 3
    A semifinal.
  4. 4
    A partial erection of the penis.
  5. 5
    A semiautomatic firearm.
  6. 6
    Semiconductor companies or positions in the stock market.
  7. 7
    An intermediate in the production of end-use goods.

Recorded use

Wiktionary examples

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

  1. 2008, Elliott Placks, quoted in Helen Isbister, Morris Bryant, Property, Career FAQs, Australia, page 40, I′m selling two side-by-side semis that are currently under construction, a waterfront apartment and a house in Rose Bay.
  2. The smaller semis of the 1920s and 1930s were closely related to the three bedroom pre-1919 narrow fronted terraces, at least to the larger pre-1919 terraces.

Etymology

The prefix semi- (from Latin) used as a noun.

This word in other languages

demi-molle(Français)

Common misspellings

Also misspelled as:

  • esmi
  • seim
  • semmi
  • smei
  • ssemi

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of semi - 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.

esmi2seim2semmi1smei2ssemi1
Edit distance from "semi"

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 "semi"?
"semi" is spelled S-E-M-I. The IPA pronunciation is /ˈsɛmi/.
What does "semi" mean?
As a noun, "semi" means: A semi-detached house.
What words are commonly confused with "semi"?
"semi" is commonly confused with "SI", "SM", "set". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "semi"?
The IPA (International Phonetic Alphabet) transcription for "semi" is /ˈsɛmi/. 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 "semi"?
The prefix semi- (from Latin) used as a noun. 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.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "semi", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 4 letters (nearest by frequency rank).

nose#2,956wise#2,975lock#2,954aged#2,977

Similar misspelling depth

Headwords with a similar count of attested misspellings (5 here; floor ≥5).

lets5 variantsinner5 variantsgrab5 variantseric5 variants

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

Source: FrequencyWords open word-frequency list