'anciens' originates from French, specifically the word 'ancien', where 'ancien' meant 'former' or 'old'.

'ancien' was adopted into English in certain contexts, especially in reference to alumni of French institutions, and the plural 'anciens' is used in the same way as in French.

Initially, it meant 'old' or 'former', but in English usage, it evolved to specifically refer to former students or alumni.