Where does “triviaalikoulu” come from?

triviaalikoulu (Finnish) comes from Finnish triviaali, from Latin trivialis, from Latin trivius, from Latin tri-, from Latin trēs, from Proto-Italic trēs, from Proto-Indo-European *tréyes.

triviaalikoulu (Finnish): trivial school

Definitions

trivial school

Ancestry of “triviaalikoulu”, step by step

triviaalikoulu traces back through two separate lines of ancestry.

via Finnish triviaali

Step	Language	Word	Meaning
1	Finnish	triviaali	trivial
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	—

via Finnish koulu

Step	Language	Word	Meaning
1	Finnish	koulu	school
2	Latin	schola	Leisure time given to learning; schooltime,...
3	Ancient Greek	σχολή	leisure, free time; rest; that in which leisure...
4	Proto-Hellenic	skʰolā́	—
5	Proto-Indo-European	sǵʰ-h₃-léh₂	—
6	Proto-Indo-European	seǵʰ-	to hold; to overpower

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