'evenly-leveled' originates from the combination of 'evenly' and 'leveled', where 'evenly' means 'in a smooth, equal manner' and 'leveled' means 'made flat or even'.

'Evenly' comes from Old English 'efenlice', and 'leveled' comes from the Old French 'leveler', which was derived from Latin 'libella', meaning 'a balance or level'.

Initially, 'evenly-leveled' meant 'made flat in a balanced manner', and this meaning has largely remained the same in modern usage.