'efficiently-modified' originates from the combination of 'efficiently' and 'modified'. 'Efficiently' comes from Latin 'efficientem', meaning 'accomplishing', and 'modified' comes from Latin 'modificare', meaning 'to measure or limit'.

'Efficiently-modified' is a modern English term formed by combining 'efficiently' and 'modified', reflecting the trend of creating compound adjectives to describe enhanced or optimized states.

Initially, 'efficiently' meant 'in a manner that achieves maximum productivity with minimum wasted effort', and 'modified' meant 'changed or altered'. Together, they describe something that has been altered to be more effective.