'properly-structured' originates from the combination of 'properly' and 'structured', where 'properly' means 'in a suitable manner' and 'structured' means 'arranged in a definite pattern'.

'Properly' comes from the Latin word 'proprius', meaning 'one's own', and 'structured' comes from the Latin word 'structura', meaning 'a fitting together'.

Initially, 'properly' meant 'in a manner that is one's own', and 'structured' meant 'fitting together'. Over time, they combined to mean 'organized in a suitable manner'.