'anallagmatic' originates from Greek, specifically the word 'anallagmatikos', where 'ana-' meant 'again' or 'back' and 'allassein' meant 'to change'.

'anallagmatikos' changed from Greek to Late Latin 'anallagmaticus', and eventually became the modern English word 'anallagmatic'.

Initially, it meant 'capable of being changed or exchanged', but over time it evolved into its current meaning of 'relating to reciprocal mathematical transformations'.