'long-term' originates from the combination of 'long' and 'term', where 'long' meant 'having considerable duration' and 'term' meant 'a fixed or limited period'.

'long-term' evolved from the Old English word 'lang' and the Latin word 'terminus', eventually becoming the modern English word 'long-term'.

Initially, it meant 'a period of considerable duration', but over time it evolved into its current meaning of 'lasting or extending over a long period'.