The story
- Proto-Indo-European*h₁es-
- Proto-Indo-European*h₁ésti
- Proto-Indo-European*bʰuH-
- Proto-Indo-European*bʰúHt
- Proto-Italic*ezom~*som
- Old Latinesum
- Latinsumbf.
- Latinēns
- Medieval Latinentitās
- Englishentity
- English todayentitative
Etymology from Wiktionary, CC BY-SA 4.0.