Where does “supermunicipal” come from?

supermunicipal (English) comes from English municipal, from French municipal, from Latin mūnicipālis, from Latin mūnicipium, from Latin mūniceps, from Latin -ceps, from Old Latin -cipes, from Proto-Italic -kaputis — to seize, hold.

Ancestry of “supermunicipal”, step by step

supermunicipal traces back through two separate lines of ancestry.

via English municipal

StepLanguageWordMeaning
1EnglishmunicipalOf or pertaining to a municipality; Of or...
2Frenchmunicipalmunicipal
3Latinmūnicipālismunicipal
4Latinmūnicipiumtownship
5Latinmūnicepscitizen (of a municipium)
6Latin-ceps-headed; -fold; -catcher
7Old Latin-cipes"third declension"; Alternative form of -ceps;...
8Proto-Italic-kaputis-headed
9Proto-Italickaputhead
10Proto-Indo-Europeankáputhead
11Proto-Indo-Europeankap-to seize, hold

via English super

StepLanguageWordMeaning
1EnglishsuperOf excellent quality, superfine; better than...
2Englishsuper-egoAlternative spelling of superego
3GermanÜber-Ichsuperego
4GermanIchego, the Ich; self, me, him, etc
5Middle High GermanichI
6Old High GermanihI
7Proto-West GermanicikI
8Proto-Germanic*ek
9Proto-Indo-Europeanéǵh₂I
Every word from Proto-Indo-European kap-Every word from Proto-Indo-European káputEvery word from Proto-Italic kaput