'average' originates from Middle English, specifically the word 'averag(e),' where 'aver' meant 'to estimate.' 'Income' originates from Middle English, specifically the word 'incomen,' where 'in-' meant 'into' and 'comen' meant 'to come.'

'average' changed from the Old French word 'avarie' and eventually became the modern English word 'average.' 'Income' transformed from the Old English word 'incuman' and eventually became the modern English word 'income.'

Initially, 'average' meant 'a financial charge or duty,' but over time it evolved into its current meaning of 'typical or standard.' 'Income' initially meant 'entrance or arrival,' but over time it evolved into its current meaning of 'money received.'