Where does “vähentäminen” come from?

vähentäminen (Finnish) comes from Finnish vähentää, from Ingrian vähä, from Ingrian -in, from Proto-Finno-Ugric *-in, from Proto-Uralic -ma.

Ancestry of “vähentäminen”, step by step

StepLanguageWordMeaning
1FinnishvähentääTo decrease, reduce, diminish; To deduct; To...
2Ingrianvähälittle, small; scanty, meagre; little, few
3Ingrian-inForms adjectives indicating the material of which something is made; -en
4Proto-Finno-Ugric*-in—
5Proto-Uralic-ma—
Every word from Proto-Uralic -ma →Every word from Ingrian -in →Every word from Ingrian vähä →