Where does “ümumiyyətcə” come from?

ümumiyyətcə (Azerbaijani) comes from Azerbaijani -cə, from Proto-Turkic *-če — Suffix expressing the equative case.

Ancestry of “ümumiyyətcə”, step by step

StepLanguageWordMeaning
1Azerbaijani-cəSuffix to form adverbs when added to names of ethnic groups or countries
2Proto-Turkic*-čeSuffix expressing the equative case
Every word from Proto-Turkic *-če →Every word from Azerbaijani -cə →