'sporadically-transmitted' originates from the combination of 'sporadic' and 'transmitted'. 'Sporadic' comes from the Greek word 'sporadikos', meaning 'scattered', and 'transmitted' is derived from the Latin 'transmittere', where 'trans-' meant 'across' and 'mittere' meant 'to send'.

'Sporadic' changed from the Greek word 'sporadikos' to the modern English word 'sporadic', and 'transmitted' evolved from the Latin 'transmittere' to the modern English 'transmit'.

Initially, 'sporadic' meant 'scattered or dispersed', and 'transmitted' meant 'sent across'. Over time, 'sporadically-transmitted' evolved to describe something that is irregularly passed from one to another.