'confidently' originates from Latin, specifically the word 'confidere,' where 'con-' meant 'with' and 'fidere' meant 'to trust.' 'Assemble' originates from Latin, specifically the word 'assimblare,' where 'ad-' meant 'to' and 'simulare' meant 'to make similar.'

'Confidere' transformed into the Old French word 'confidant,' and eventually became the modern English word 'confidently.' 'Assimblare' transformed into the Old French word 'assembler,' and eventually became the modern English word 'assemble.'

Initially, 'confidently' meant 'with trust,' but over time it evolved into its current meaning of 'with assurance.' 'Assemble' initially meant 'to bring together,' and this meaning has largely remained the same in modern usage.