Definition of sone in English:

sone

noun

  • A unit of subjective loudness, equal to 40 phons.

    • ‘Technically, one sone equals a 1-khz tone at 40 dB SPL (Sound Pressure Level).’
    • ‘At the quieter end of the spectrum, you'll find ones rated at a much quieter 2.5 sones, and the price goes up to about $100.’

Origin

1930s: from Latin sonus a sound.

Pronunciation:

sone

/səʊn/