'sporadically-assessed' originates from the combination of 'sporadic' and 'assess', where 'sporadic' comes from Medieval Latin 'sporadicus', meaning 'scattered', and 'assess' from Latin 'assidere', meaning 'to sit beside'.

'sporadicus' transformed into the English word 'sporadic', and 'assidere' evolved into 'assess' in English, eventually forming the compound adjective 'sporadically-assessed'.

Initially, 'sporadic' meant 'scattered or isolated', and 'assess' meant 'to evaluate'. Together, they evolved to mean 'evaluated at irregular intervals'.