Standard Lemma guide

smoothness

noun · 8 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • Southern-England: Recorded audio is listed in the source snapshot.
  • CMU ARPABET: S M UW1 DH N AH0 S Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

noun

Meaning 1

The condition of being smooth; the degree or measure of said condition.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

The highest order of derivative (the differentiability class) over a given domain.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Topics: mathematical-analysis, mathematics, sciences

Examples

  • Smoothness can vary from 0 (for a nondifferentiable function) to infinity (for a smooth function).

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

The quantity measured by the modulus of smoothness.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Qualifier: approximation theory; numerical analysis; approximation theory; numerical analysis

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

noun

Meaning 4

the quality of being free from errors or interruptions

Definition source: Princeton WordNet 3.0

Examples

  • the five-speed manual gearbox is smoothness personified

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: effortlessness

5

noun

Meaning 5

the quality of having a level and even surface

Definition source: Princeton WordNet 3.0

Examples

  • the water was a glassy smoothness
  • the weather system of the Pacific is determined by the uninterrupted smoothness of the ocean

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: evenness, invariability

6

noun

Meaning 6

the quality of being bland and gracious or ingratiating in manner

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: suavity, suaveness, blandness

Antonyms: none provided

Broader terms: graciousness

7

noun

Meaning 7

a texture without roughness; smooth to the touch

Definition source: Princeton WordNet 3.0

Examples

  • admiring the slim smoothness of her thighs
  • some artists prefer the smoothness of a board

Meaning relationships

Synonyms: none provided

Antonyms: roughness

Broader terms: texture

Narrower terms: silkiness, sleekness, slickness, slick, slipperiness, slip, fineness, powderiness, polish, gloss, glossiness, burnish

8

noun

Meaning 8

powerful and effective language

Definition source: Princeton WordNet 3.0

Examples

  • his eloquence attracted a large congregation
  • fluency in spoken and written English is essential
  • his oily smoothness concealed his guilt from the police

Meaning relationships

Synonyms: eloquence, fluency

Antonyms: none provided

Broader terms: expressive style, style

History

Etymology

From Middle English smothenesse; equivalent to smooth + -ness. Compare Old English smēþnes (“smoothness, a smooth place, a level surface”).

Across languages

Translations

25 source translations are retained for this English entry.

  • Armenian: ողորկություն (oġorkutʻyun) — condition of being smooth
  • Belarusian: гла́дкасць (hládkascʹ) — condition of being smooth
  • Central Bikol: yumok — condition of being smooth
  • Bulgarian: гладкост (gladkost) — condition of being smooth
  • Dutch: gladheid — condition of being smooth
  • Finnish: pehmeys — condition of being smooth
  • Finnish: tasaisuus — condition of being smooth
  • Finnish: sileys — condition of being smooth
  • German: Glätte — condition of being smooth
  • Hindi: चिकनाई (ciknāī) — condition of being smooth
  • Hungarian: simaság — condition of being smooth
  • Ido: glateso — condition of being smooth
  • Italian: levigatezza — condition of being smooth
  • Latin: lēvitās — condition of being smooth
  • Latvian: gludums — condition of being smooth
  • Middle English: smethenesse — condition of being smooth
  • Middle English: smothenesse — condition of being smooth
  • Polish: gładkość — condition of being smooth
  • Portuguese: suavidade — condition of being smooth
  • Russian: гла́дкость (gládkostʹ) — condition of being smooth
  • Sundanese: lemesna — condition of being smooth
  • Swahili: ulaini — condition of being smooth
  • Ottoman Turkish: دوزلك (düzlük) — condition of being smooth
  • Ukrainian: гла́дкість (hládkistʹ) — condition of being smooth
  • Finnish: sileys — quantitative measure of how smooth a function is