'accurately-tuned' originates from the combination of 'accurate' and 'tuned', where 'accurate' means 'free from error' and 'tuned' refers to 'adjusting to a specific pitch or frequency'.

'Accurate' comes from the Latin word 'accuratus', meaning 'done with care', and 'tuned' comes from the Old English 'tune', meaning 'a musical sound'.

Initially, 'accurate' meant 'done with care', and 'tuned' referred to 'musical sound'. Over time, 'accurately-tuned' evolved to mean 'precisely adjusted'.