Etymology

unitless

U1N1I1T1L1E1S1S1

Today it means: Having no units of measurement; such as a ratio or percentage of two numbers which have the same units. Full definition →

Proto-Germanic *lausaz ← Proto-Indo-European *lewHs- ← English unit
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The story

  1. Englishunit
  2. Proto-Indo-European*lewh₁-
  3. Proto-Indo-European*lewHs-
  4. Proto-Germanic*leusaną
  5. Proto-Germanic*lausaz
  6. English todayunitless

From unit + -less.

Etymology from Wiktionary, CC BY-SA 4.0.