'coexistently' originates from Latin, specifically the word 'coexistere,' where 'co-' meant 'together' and 'existere' meant 'to exist.'

'coexistere' transformed into the French word 'coexister,' and eventually became the modern English word 'coexist' and its derivatives like 'coexistent' and 'coexistently.'

Initially, it meant 'to exist together,' and this meaning has remained consistent in modern usage, with 'coexistently' describing the manner of such existence.