'interventionism' originates from the word 'intervene,' which comes from Latin 'intervenire,' where 'inter-' meant 'between' and 'venire' meant 'to come.'

'intervenire' transformed into the French word 'intervenir,' and eventually became the modern English word 'intervene,' leading to 'interventionism.'

Initially, it meant 'to come between,' but over time it evolved into its current meaning of 'policy of intervening in other countries' affairs.'