'superfluity' originates from Latin, specifically the word 'superfluitas', where 'super-' meant 'above' and 'fluere' meant 'to flow'.

'superfluitas' transformed into the Old French word 'superfluité', and eventually became the modern English word 'superfluity'.

Initially, it meant 'overflowing or excessive', but over time it evolved into its current meaning of 'an excessive amount or number of something'.