Standard Lemma guide

dimensionless

adj · 2 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.

No pronunciation record was provided for this word.

1

adj

Meaning 1

Lacking dimensions.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

Examples

  • 1930, E. E. Smith, Skylark Three, Fantasy Press, 1948, Chapter 3, They saw the utter, absolute darkness of the complete absence of all light; and upon that indescribable blackness they beheld superimposed the almost unbearable brilliance of enormous suns concentrated into mathematical points, dimensionless.

Meaning relationships

Synonyms: adimensional

Antonyms: none provided

2

adj

Meaning 2

Of a physical constant: lacking units.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

Topics: sciences

Examples

  • Iron has a density of 7.8 grams per cubic centimeter: its dimensionless relative density is 7.8.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

Etymology tree Proto-Indo-European *dwóh1 Proto-Indo-European *d(w)is- Proto-Italic *dis- Latin dis- Proto-Indo-European *meh1- Proto-Italic *mētis Latin mētior Latin dīmētior Proto-Indo-European *-tis Proto-Indo-European *-Hō Proto-Indo-European *-tiHō Proto-Italic *-tiō Latin -tiō Latin dīmēnsiōder. English dimension Proto-Indo-European *lewh1- Proto-Indo-European *lewHs-der. Proto-Germanic *leusaną Proto-Germanic *lausaz Proto-Germanic *-lausaz Proto-West Germanic *-laus Old English -lēas Middle English -les English -less English dimensionless From dimension + -less.

Across languages

Translations

5 source translations are retained for this English entry.

  • Bulgarian: безразмерен (bezrazmeren) — dimensionless
  • Danish: uden dimensioner — dimensionless
  • Greek: αδιάστατος (adiástatos) — dimensionless
  • Norwegian Bokmål: dimensjonsløs — dimensionless
  • Polish: bezwymiarowy — dimensionless