The story
- Latin · derived fromdēmōnstrātiōnem
- Old French · derived fromdemonstration
- Middle English · inherited fromdemonstracioun
- English todaydemonstration
From Middle English demonstracioun, from Old French demonstration, from Latin dēmōnstrātiōnem, from dēmōnstrāre (“show or explain”), from dē- (“of or concerning”) + mōnstrāre (“show”). Morphologically demonstrate + -ion.
Etymology from Wiktionary, CC BY-SA 4.0.