'decolonizer' originates from the English word 'decolonize,' which combines the prefix 'de-' meaning 'reverse' or 'remove' with 'colonize,' derived from Latin 'colonia' meaning 'settlement.'

'decolonize' evolved from the Latin word 'colonia,' which transformed into the English word 'colonize,' and eventually became 'decolonize' with the addition of the prefix 'de-'.

Initially, it meant 'to remove colonial rule,' and this meaning has largely remained the same in modern usage.