flatness
/ˈflætnəs/noun
flatness is spelled F-L-A-T-N-E-S-S: 8 letters and 2 syllables. It appears about once in every 4 million words in written English, the 58,714th most frequent word form (wordfreq, 2021 data). As a noun, flatness means “The state of being flat” (English Wiktionary, September 2026). The plural of flatness is flatnesses.
How many letters and syllables are in flatness?
| Letters | 8: F-L-A-T-N-E-S-S |
|---|---|
| Syllables | 2 (from its American pronunciation) |
| In writing | about once in every 4 million words; the 58,714th most frequent word form |
| Wrong spellings searched | none measured in search |
| Rhymes with |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation and the CMU Pronouncing Dictionary; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); rhymes and same-letter words are computed by PlainSpell from its own word list.
How common is flatness?
Flatness appears about once in every 4 million words in written English, the 58,714th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce flatness?
- US /ˈflætnəs/
Flatness has 2 syllables (counted from its American pronunciation in the CMU Pronouncing Dictionary).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Sapaa-flatness.wav, Wikimedia Commons (author and licence on each file's page).
What rhymes with flatness?
One word on PlainSpell end in the same sounds as flatness from its last stressed vowel (/ætnəs/):
Computed by PlainSpell from the pronunciations in the English Wiktionary (dump of September 2, 2026): a rhyme shares every sound from the last stressed vowel to the end; ordered by written frequency (wordfreq 3.1).
Forms of flatness
- flatnesses plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does flatness mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
The state of being flat
- 2
The state of being two-dimensional; planar : planarity
- 3
The state of being bland : dullness
- 4
Mattness, the quality of a painted surface which scatters or absorbs the light falling on it, so as to be substantially free from gloss or sheen
- 5
Lack of bouquet and freshness of a wine, through too much aeration or infection with film yeasts
- 6
slim-tailedness or platykurtosis.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Flatness in Spanish, French, German and Portuguese
| Language | Words |
|---|---|
| French | planéité , planitude , platitude , matité , goût de l’évent |
| German | Flachheit , Ebenheit |
| Spanish | planicidad, planitud , planaridad , aburrición , matidez |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does flatness come from?
From Middle English flatnesse, equivalent to flat + -ness.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).