'immediately' originates from Latin, specifically the word 'immediatus,' where 'in-' meant 'not' and 'medius' meant 'middle.' 'Complete' originates from Latin, specifically the word 'completus,' where 'com-' meant 'together' and 'plere' meant 'to fill.'

'immediatus' transformed into the Old French word 'immediat,' and eventually became the modern English word 'immediate.' 'Completus' transformed into the Old French word 'complet,' and eventually became the modern English word 'complete.'

Initially, 'immediate' meant 'without anything in between,' and 'complete' meant 'to fill up.' Over time, 'immediately-completed' evolved to mean 'finished without delay.'