The story
- Proto-Indo-European*de
- Proto-Indo-European*déh₁
- Proto-Italic*dē
- Latindē
- Latindē-
- Proto-Indo-European*men-
- Proto-Indo-European*monéyeti
- Proto-Italic*man-eje-
- Proto-Italic*moneō
- Proto-Italic*monestrom
- Latinmōnstrum
- Latinmōnstrō
- Latindēmōnstrō
- Latindēmōnstrātus
- English todaydemonstrate
Borrowed from Latin dēmonstrātus, the perfect passive participle of dēmonstrō (“to show, point at”), see -ate (verb-forming suffix). Cognate with French démontrer.
Etymology from Wiktionary, CC BY-SA 4.0.