Where does “semitrivial” come from?

semitrivial (English) comes from English trivial, from Latin trivialis, from Latin trivius, from Latin tri-, from Latin trēs, from Proto-Italic trēs, from Proto-Indo-European *tréyes.

semitrivial (English): semisystematic

Definitions

semisystematic

Ancestry of “semitrivial”, step by step

Step	Language	Word	Meaning
1	English	trivial	Ignorable; of little significance or value;...
2	Latin	trivialis	common, commonplace, ordinary, trivial
3	Latin	trivius	of or belonging to crossroad temples
4	Latin	tri-	three, tri-
5	Latin	trēs	three; 3
6	Proto-Italic	trēs	three
7	Proto-Indo-European	*tréyes	—

Every word from Proto-Indo-European *tréyes →Every word from Proto-Italic trēs →Every word from Latin trēs →