Etymology

additionary

ad·dit·ion·a·ry
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Today it means: Synonym of additional. Full definition →

English addition ← Middle English addicioun ← Old French adition
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The story

  1. Latinadditiō
  2. Old Frenchadition
  3. Middle Englishaddicioun
  4. Englishaddition
  5. English todayadditionary

From addition + -ary.

Etymology from Wiktionary, CC BY-SA 4.0.