'variably-produced' originates from the combination of 'variable' and 'produce,' where 'variable' meant 'capable of change' and 'produce' meant 'to bring forth or create.'

'variable' changed from the Latin word 'variabilis' and 'produce' from the Latin word 'producere,' eventually forming the modern English term 'variably-produced.'

Initially, 'variable' meant 'capable of change,' and 'produce' meant 'to bring forth,' evolving into the current meaning of 'produced in a non-uniform manner.'