The story
- Proto-Indo-European*gʷreh₂-
- Proto-Indo-European*gʷréh₂us
- Proto-Italic*gʷraus
- Latingravis
- Latingravitō
- New Latingravitātiō
- Englishgravitation
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Englishgravitational
- Proto-Indo-European*leyg-
- Proto-Germanic*līką
- English todaygravitationally
From gravitational + -ly.
Etymology from Wiktionary, CC BY-SA 4.0.