Etymology

illusory

il·lu·so·ry
I1L1L1U1S1O1R1Y4

Today it means: Resulting from an illusion; deceptive, imaginary, unreal. Full definition →

Middle French illusorie ← Latin illūsōrius
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The story

  1. Latin · derived fromillūsōrius
  2. Middle French · borrowed fromillusorie
  3. English todayillusory

Borrowed from Middle French illusorie (modern French illusoire), derived from Latin illūsōrius (“mocking, ironical”).

Etymology from Wiktionary, CC BY-SA 4.0.