Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Scottish Gaelic
aimsir
←
Proto-Celtic
*amsterā
(inherited)
←
Welsh
amser
(cognate)
←
Old Irish
aimser
(inherited)
→
Scottish Gaelic
co-aimsireil
(affix)