Etymology

invariable

in·va·ri·able
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Today it means: Not variable; unalterable; uniform; always having the same value. Full definition →

English variable ← Middle English in- ← Latin in-
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The story

  1. Proto-Indo-European*né
  2. Proto-Indo-European*n̥-
  3. Proto-Italic*n̥-
  4. Latinin-
  5. Middle Englishin-
  6. Englishin-
  7. Englishvariable
  8. English todayinvariable

From in- + variable. Piecewise doublet of unvariable.

Etymology from Wiktionary, CC BY-SA 4.0.