Where does “pääsäännöllisesti” come from?

pääsäännöllisesti (Finnish) comes from Finnish pääsäännöllinen, from Finnish pääsääntö, from Finnish sääntö, from Finnish saada, from Proto-Finnic saadak, from Proto-Uralic saxe-, from Proto-Indo-European seǵʰ- — to hold; to overpower.

Ancestry of “pääsäännöllisesti”, step by step

StepLanguageWordMeaning
1Finnishpääsäännöllinen
2Finnishpääsääntömain rule, general rule, fundamental rule
3Finnishsääntörule; regulation; laws, rules, bylaws, code
4Finnishsaadato get, receive; to afford; usually in passive;...
5Proto-Finnicsaadakto get, to receive
6Proto-Uralicsaxe-to get; to arrive
7Proto-Indo-Europeanseǵʰ-to hold; to overpower
Every word from Proto-Indo-European seǵʰ-Every word from Proto-Uralic saxe-Every word from Proto-Finnic saadak