'permanently-gathered' originates from the combination of 'permanent' and 'gathered', where 'permanent' comes from Latin 'permanens', meaning 'enduring', and 'gathered' from Old English 'gadrian', meaning 'to bring together'.

'permanently-gathered' evolved from the Middle English 'permanente' and 'gadered', eventually forming the modern English compound adjective 'permanently-gathered'.

Initially, it meant 'to be collected for a long duration', and this meaning has largely remained the same in modern usage.