The story
- Proto-Indo-European*ḱe?
- Proto-Indo-European*ḱóm
- Proto-Italic*kom
- Proto-Italic*kom-
- Latincon-
- Proto-Italic*katesnā
- Latincatēna
- Latincatēnō
- Latinconcatēnō
- Latinconcatēnātus
- Englishconcatenate
- English todayconcatenative
From concatenate + -ive.
Etymology from Wiktionary, CC BY-SA 4.0.