'marginally' originates from the word 'marginal,' which comes from the Latin word 'marginalis,' where 'margo' meant 'edge or border.'

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

Initially, it meant 'related to the edge or border,' but over time it evolved into its current meaning of 'slightly or to a small extent.'