'infestation' originates from Latin, specifically the word 'infestatio,' where 'infestare' meant 'to attack or disturb.'

'infestatio' transformed into the Old French word 'infestation,' and eventually became the modern English word 'infestation' through Middle English.

Initially, it meant 'to attack or disturb,' but over time it evolved into its current meaning of 'presence of pests in large numbers.'