'auxiliate' originates from Latin, specifically from the verb 'auxili
01ri' and the noun 'auxilium', where 'auxilium' meant 'help, aid'.

'auxili
01ri' (Latin) passed into Late Latin/Medieval Latin forms and was taken into English usage as a learned formation (compare 'auxiliary' and 'auxilium'), eventually appearing in English in rare or literary contexts as 'auxiliate'.

Initially, it meant 'to give help or aid' in the sense of acting as an auxiliary; over time the meaning has remained largely the same but the word has remained rare compared with synonyms like 'assist' or 'aid'.