The term 'income-driven' combines 'income,' from Middle English 'incom,' meaning 'money received,' and 'driven,' from Old English 'drifan,' meaning 'to drive or propel.'

'Income' evolved from Middle English 'incom,' while 'driven' evolved from Old English 'drifan.' The modern term 'income-driven' reflects a concept influenced by financial earnings.

Initially, 'income' referred to any money received, and 'driven' meant propelled. Together, they now describe something influenced by financial earnings.