'annexionist' originates from English, specifically the word 'annexion' + the suffix '-ist', where 'annexion' ultimately comes from Latin 'annexio' and the verb 'annectere' (from 'ad-' + 'nectere'), in which 'ad-' meant 'to/toward' and 'nectere' meant 'to bind'.

'annexionist' changed from the Medieval Latin word 'annexio' and the Old French word 'annexion', and eventually became the modern English word 'annexionist'.

Initially, it meant 'joining' or 'binding' (the sense of attaching one thing to another), but over time it evolved into its current meaning of 'a person who advocates the political incorporation (annexation) of territory'.