Where does “sōlemnizō” come from?

sōlemnizō (Medieval Latin) comes from Latin sollemnis, from Latin sollemne — religious rite, ceremony, feast, sacrifice;...

Ancestry of “sōlemnizō”, step by step

Step	Language	Word	Meaning
1	Latin	sollemnis	yearly, annually; established, appointed, fixed;...
2	Latin	sollemne	religious rite, ceremony, feast, sacrifice;...