'adherer' originates from Latin, specifically the word 'adhaerere,' where 'ad-' meant 'to' and 'haerere' meant 'to stick.'

'adhaerere' transformed into the Old French word 'adhérer,' and eventually became the modern English word 'adhere' through Middle English.

Initially, it meant 'to stick to something,' but over time it evolved into its current meaning of 'to support or follow something.'