'conjunction' originates from Latin, specifically the word 'conjunctio', where 'con-' meant 'together' and 'jungere' (or 'junct-') meant 'to join'.

'conjunction' changed from Latin 'conjunctio' into Old French/Medieval Latin forms and then into Middle English 'conjunc(i)on', eventually becoming the modern English 'conjunction'.

Initially, it meant 'a joining together' in a general sense; over time the meaning extended to a specific grammatical term for words that join elements, while the general sense (a meeting or union) has been retained.