One of the mysteries of the English language finally explained.
(As two words or hyphenated.) Either of the two equal intervals of a whole tone into which a major third may be divided, used as a basis for tuning keyboard instruments before the general adoption of equal temperament.
Late 18th century; earliest use found in Thomas Young (1773–1829), physician and natural philosopher. From mean + tone.
mean tone/ˈmiːn ˌtəʊn/
In this article we explore how to impress employers with a spot-on CV.