Where does “lämmönkehitys” come from?

lämmönkehitys (Finnish) comes from Finnish kehitys, from Finnish kehittää, from Finnish kehitä, from Finnish -itä, from Proto-Finnic -it'ak — Forms verbs.

lämmönkehitys (Finnish): release of heat, heat generation

Definitions

release of heat, heat generation

Ancestry of “lämmönkehitys”, step by step

lämmönkehitys traces back through two separate lines of ancestry.

via Finnish kehitys

Step	Language	Word	Meaning
1	Finnish	kehitys	development, improvement, advancement, evolution
2	Finnish	kehittää	to unravel, unwind; to develop, advance, improve;...
3	Finnish	kehitä	—
4	Finnish	-itä	Front vowel variant of -ita
5	Proto-Finnic	-it'ak	Forms verbs

via Finnish lämpö

Step	Language	Word	Meaning
1	Finnish	lämpö	warmth, heat; heat; fever
2	Finnish	-o	Forms result or action nouns from verbs; Forms...
3	Proto-Finnic	-o	Forms action/result nouns from verbs
4	Proto-Uralic	-w	—

Every word from Proto-Finnic -it'ak →Every word from Finnish -itä →Every word from Finnish kehitä →