'appendance' originates from Latin, specifically the verb 'appendere', where 'ad-' meant 'to, toward' and 'pendere' meant 'to hang'.

'appendance' changed from Middle English 'appendaunce' (influenced by Anglo-Norman forms such as 'apendance') and ultimately became the modern English word 'appendance'.

Initially it was related to the action 'to hang upon' or 'to attach', and over time it evolved into the noun meaning 'something attached' or 'an attendant', which is how it is used now (the attendant sense is now largely archaic).