flat

/flæt/

//flæt// adj

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

The verdict

“flat” has 6 generated spelling variants in the English index at frequency #1,941. The variants make it a useful spelling check.

#1,941
frequency rank, English
2,507
“F” headwords
6
tracked misspellings
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Having no variations in height.

Corpus desk

Index EN-flat · flat · English

flat · rank #1,941 · 6 variants · 20 confusables

  • FREQ-COMMON #1,941
  • LEN-MID 4 letters
  • VOW-1 1 vowel
  • CONFUS-HIGH 20 pairs
  • VAR-MID 6 variants
  • BOOK-MID 2,507
  • PHOTO-FINISH festival

Nearest frequency peer: festival (-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 “flat”

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

corpus weight

What this shows “flat” 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).

flat vs fly
50% similar
flat vs flu
50% similar
flat vs Flo
25% similar

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

Key facts for flat
PropertyValue
Headwordflat
LanguageEnglish
Part of speechAdjective
IPA/flæt/
Letters4
Frequency rank#1,941
Misspellings tracked6
Confusable pairs20
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “flat”

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

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

The axis is logarithmic, with each marked tick roughly ten times rarer than the last. Same rarity band neighbours include “festival” (#1,940), “fuel” (#1,942), “failure” (#1,939). Among 2,507 “F” headwords, “flat” is #1,941. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 6 spelling variants around flat (IPA /flæt/), anadjective. Corpus frequency is #1,941 among 2,507 “F” headwords. Wiktionary lists 30 senses, so context still picks the gloss.

Our generated misspelling index lists 6 likely wrong-spelling variants for flat, with forms such as "falt", "fflat", and "flatt". 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, "fly", "flu", "Flo", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.

Etymologically, the entry records: From Middle English flat, a borrowing from Old Norse flatr (compare Norwegian and Swedish flat, Danish flad), from Proto-Germanic *flataz, from Proto-Indo-European *pleth₂- (“flat”); akin to Saterland Frisian flot (“smooth”), German Flöz (“a geological laye… The correct English form is flat, spelled F-L-A-T.

Definition

  1. 1
    Having no variations in height.
  2. 2
    Having no variations in height.
  3. 3
    Having no variations in height.
  4. 4
    Having no variations in height.
  5. 5
    Without variation in level, quantity, value, tone etc.
  6. 6
    Without variation in level, quantity, value, tone etc.
  7. 7
    Without variation in level, quantity, value, tone etc.
  8. 8
    Without variation in level, quantity, value, tone etc.
  9. 9
    Without variation in level, quantity, value, tone etc.
  10. 10
    Without variation in level, quantity, value, tone etc.
  11. 11
    Lacking liveliness or action; depressed; uninteresting; dull and boring.
  12. 12
    Lacking liveliness or action; depressed; uninteresting; dull and boring.
  13. 13
    Lowered by one semitone.
  14. 14
    Of a note or voice, lower in pitch than it should be.
  15. 15
    Absolute; downright; peremptory.
  16. 16
    Deflated, especially because of a puncture.
  17. 17
    With all or most of its carbon dioxide having come out of solution so that the drink no longer fizzes or contains any bubbles.
  18. 18
    Lacking acidity without being sweet.
  19. 19
    Unable to emit power; dead.
  20. 20
    Without spin; spinless.
  21. 21
    Sonant; vocal, as distinguished from a sharp (non-sonant) consonant.
  22. 22
    Not having an inflectional ending or sign, such as a noun used as an adjective, or an adjective as an adverb, without the addition of a formative suffix; or an infinitive without the sign "to".
  23. 23
    Having a head at a very obtuse angle to the shaft.
  24. 24
    Flattening at the ends.
  25. 25
    Exact.
  26. 26
    Such that the tensor product preserves exact sequences. See Flat module on Wikipedia.Wikipedia.
  27. 27
    Such that its target, regarded as a module over its source, is flat (as above).
  28. 28
    Such that the induced map on every stalk is flat (as a map of rings).
  29. 29
    Having little froth and little milk.
  30. 30
    Foolish; simple-minded.

Recorded use

Wiktionary examples

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

  1. The land around here is flat.
  2. The surface of the mirror must be completely flat.

Etymology

From Middle English flat, a borrowing from Old Norse flatr (compare Norwegian and Swedish flat, Danish flad), from Proto-Germanic *flataz, from Proto-Indo-European *pleth₂- (“flat”); akin to Saterland Frisian flot (“smooth”), German Flöz (“a geological layer”), Ancient Greek πλατύς (platús), Latvian plats, Sanskrit प्रथस् (prathas, “extension”). Doublet of plat and pleyt. The noun is from Middle English flat (“level piece of ground, flat edge of a weapon”), from the adjective. The algebraic sense was coined by Serre in a 1956 paper, originally as French plat.

Synonyms

Antonyms

This word in other languages

Common misspellings

Also misspelled as:

  • falt
  • fflat
  • flatt
  • fllat
  • flta
  • lfat

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of flat - measured in single-character edits (insert, delete, or substitute a letter). Larger bars are easier to catch; one-edit slips are the sneakiest.

falt2fflat1flatt1fllat1flta2lfat2
Edit distance from "flat"

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 "flat"?
"flat" is spelled F-L-A-T. The IPA pronunciation is /flæt/.
What does "flat" mean?
As an adjective, "flat" means: Having no variations in height.
What words are commonly confused with "flat"?
"flat" is commonly confused with "fly", "flu", "Flo". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "flat"?
The IPA (International Phonetic Alphabet) transcription for "flat" is /flæt/. 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 "flat"?
From Middle English flat, a borrowing from Old Norse flatr (compare Norwegian and Swedish flat, Danish flad), from Proto-Germanic *flataz, from Proto-Indo-European *pleth₂- (“flat”); akin to Saterland Frisian flot (“smooth”), German Flöz (“a geolo... 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 "flat", not the corpus desk frequency band.

Same letter count

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

Similar misspelling depth

Headwords with a similar count of attested misspellings (6 here; floor ≥5).

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

Source: FrequencyWords open word-frequency list