'independently-kept' originates from the combination of 'independent' and 'kept', where 'independent' means 'not relying on others' and 'kept' means 'maintained'.

'independent' evolved from the Latin word 'independens', and 'kept' is the past participle of 'keep', which comes from Old English 'cēpan'.

Initially, 'independent' meant 'not subject to control', and 'kept' meant 'held or retained'. Together, they evolved to mean 'maintained without reliance on others'.