Etymology

spontaneous

spon·ta·ne·ous
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Today it means: Self-directed; happening or acting without external cause or instigation; proceeding from natural feeling, temperament, or momentary impulse. Full definition →

Late Latin spontāneu ← Latin sponte
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The story

  1. Latinsponte
  2. Late Latinspontāneu
  3. English todayspontaneous

Learned borrowing from Late Latin spontāneus.

Etymology from Wiktionary, CC BY-SA 4.0.