smoothness
noun
smoothness is spelled S-M-O-O-T-H-N-E-S-S: 10 letters and 2 syllables. It appears about once in every 1 million words in written English, the 34,912th most frequent word form (wordfreq, 2021 data). As a noun, smoothness means “The condition of being smooth; the degree or measure of said condition” (English Wiktionary, September 2026). The plural of smoothness is smoothnesses.
How many letters and syllables are in smoothness?
| Letters | 10: S-M-O-O-T-H-N-E-S-S |
|---|---|
| Syllables | 2 (from its American pronunciation) |
| In writing | about once in every 1 million words; the 34,912th most frequent word form |
| Wrong spellings searched | none measured in search |
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).
How common is smoothness?
Smoothness appears about once in every 1 million words in written English, the 34,912th 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 smoothness?
Smoothness 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)-Vealhurl-smoothness.wav, Wikimedia Commons (author and licence on each file's page).
Forms of smoothness
- smoothnesses plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does smoothness mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
The condition of being smooth; the degree or measure of said condition.
- 2
The highest order of derivative (the differentiability class) over a given domain.
Smoothness can vary from 0 (for a nondifferentiable function) to infinity (for a smooth function).
- 3
The quantity measured by the modulus of smoothness.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Smoothness in Spanish, French, German and Portuguese
In the sense condition of being smooth:
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 smoothness come from?
From Middle English smothenesse; equivalent to smooth + -ness. Compare Old English smēþnes (“smoothness, a smooth place, a level surface”).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).