'predominantly' originates from the Latin word 'praedominari', where 'prae-' meant 'before' and 'dominari' meant 'to rule'.

'praedominari' transformed into the French word 'prédominer', and eventually became the modern English word 'predominant' through Middle English.

Initially, it meant 'to rule before others', but over time it evolved into its current meaning of 'mainly or for the most part'.