Where does “quinquagesimal” come from?
quinquagesimal (English) comes from Latin quinquagesimus, from Latin quīnquāgintā, from Proto-Indo-European penkʷēḱomt, from Proto-Indo-European *pénkʷedḱomt.
quinquagesimal (English): Relating to a set of 50
Ancestry of “quinquagesimal”, step by step