Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Latin
aeternitas
←
Proto-Indo-European
*h₂ey-
(root)
←
Latin
aeternus
(affix)
←
Latin
-tās
(affix)
→
Catalan
eternitat
(derived)
→
Middle French
aeternité
(derived)
→
Occitan
eternitat
(derived)