The story
- Proto-Indo-European*h₂éd
- Proto-Italic*ad
- Proto-Italic*ad-
- Latinad-
- Proto-Indo-European*steh₂-
- Proto-Indo-European*stísteh₂ti
- Proto-Italic*sistō
- Latinsistō
- Latinassistō
- Middle Frenchassister
- Middle Frenchassistant
- Middle Englishassistent
- English todayassistant
From Middle English assistent, from Middle French assistant, from assister. By surface analysis, assist + -ant.
Etymology from Wiktionary, CC BY-SA 4.0.