'alliterational' originates from the Latin word 'alliteratio', where 'ad-' meant 'to' and 'littera' meant 'letter'.

'alliteratio' transformed into the English word 'alliteration', and eventually became the adjective 'alliterational'.

Initially, it meant 'the repetition of the same letter or sound at the beginning of adjacent words', and this meaning has largely remained the same in modern usage.