'solely-maintained' originates from the combination of 'solely,' meaning 'alone or exclusively,' and 'maintained,' from the Latin 'manutenere,' where 'manu' meant 'hand' and 'tenere' meant 'to hold.'

'maintained' changed from the Old French word 'maintenir,' which eventually became the modern English word 'maintain.'

Initially, 'maintain' meant 'to hold in the hand,' but over time it evolved into its current meaning of 'to keep in a particular state or condition.'