Etymology

flexion

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Today it means: The act of bending a joint, especially a bone joint; the counteraction of extension. Full definition →

Latin flexiō
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The story

  1. Latin · borrowed fromflexiō
  2. English todayflexion

Borrowed from Latin flexiō, from flectō (“to bend, curve”) + -tiō, possibly via French. By surface analysis, flex + -ion.

Etymology from Wiktionary, CC BY-SA 4.0.