'purposefully-maintained' originates from the combination of 'purposefully' and 'maintained', where 'purposefully' comes from 'purpose' meaning 'intention' and '-fully' meaning 'in a manner of'. 'Maintained' comes from Latin 'manutenere', where 'manu' meant 'hand' and 'tenere' meant 'to hold'.

'purposefully-maintained' evolved from the combination of the words 'purposefully' and 'maintained', which were used separately in Middle English and later combined in modern English.

Initially, 'purposefully' meant 'with intention', and 'maintained' meant 'kept in a state'. Together, they evolved to mean 'kept in a state with intention'.