'cluster' originates from Old English, specifically the word 'clyster', where 'clyster' meant 'a number of things of the same kind growing or held together'.

'clyster' transformed into the Middle English word 'cluster', and eventually became the modern English word 'cluster'.

Initially, it meant 'a number of things of the same kind growing or held together', and this meaning has largely remained the same in modern usage.