Etymology

equation

e·qua·tion
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Today it means: The act or process of equating two or more things, or the state of those things being equal (that is, identical). Full definition →

Latin aequātiō
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The story

  1. Latin · derived fromaequātiō“an equalizing”
  2. English todayequation

From Old French, from Latin aequātiō (“an equalizing”). Morphologically equate + -ion

Etymology from Wiktionary, CC BY-SA 4.0.