'exactly-validated' originates from the combination of 'exactly' and 'validated', where 'exactly' comes from Latin 'exactus', meaning 'precisely', and 'validated' from Latin 'validare', meaning 'to confirm'.

'exactly' changed from the Latin word 'exactus' and 'validated' from 'validare', eventually forming the modern English term 'exactly-validated'.

Initially, 'exactly' meant 'precisely' and 'validated' meant 'confirmed', and this combined meaning has largely remained the same in modern usage.