Where does “semi-alphabet” come from?

semi-alphabet (English) comes from English semi-, from Latin sēmi-, from Proto-Indo-European sēmi — half; partially.

Ancestry of “semi-alphabet”, step by step

StepLanguageWordMeaning
1Englishsemi-half; partial, incomplete; somewhat, rather,...
2Latinsēmi-half
3Proto-Indo-Europeansēmihalf; partially
Every word from Proto-Indo-European sēmi →Every word from English semi- →Every word from Latin sēmi- →