Etymology

equalizer

e·qual·iz·er
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Today it means: One who makes equal; a balancer. Full definition →

English equalize ← Middle English equal ← Latin aequālis
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The story

  1. Proto-Italic*aikʷos?
  2. Old Latinaiquos
  3. Latinaequus
  4. Proto-Indo-European*h₂el-
  5. Proto-Indo-European*h₂élisder.?
  6. Latinaequālis
  7. Middle Englishequal
  8. Englishequal
  9. Englishequalize
  10. English todayequalizer

From equalize + -er (nominal suffix: agent noun).

Etymology from Wiktionary, CC BY-SA 4.0.