equally tempered scale

equally tempered scale

[¦ē·kwə·lē ¦tem·pərd ′skāl]
(acoustics)
A musical scale formed by dividing the octave into 12 equal intervals and selecting from the resulting notes; thus, the frequency ratio between any two successive notes is exactly 2¹⁄₁₂or 2. Also known as equitempered scale.