a unit used in music to describe the ratio in frequency between notes. Equal to 1/12 octave, the half step measures the difference between adjacent notes in the standard 12-tone scale, as on a piano keyboard. Two notes differ in frequency by a half step if the higher one has frequency equal to 21/12 = 1.0595 times the frequency of the lower one.

(semitone) The interval between any two adjacent notes on a keyboard; the smallest interval in common use in Western music.

A pitch difference which is the equivalent of that produced by two adjacent keys on a piano.

the closest pitch above or below any given pitch

the musical interval between adjacent keys on a keyboard instrument

the distance on the piano between any two consecutive keys, i.e. B to C, C to C# to D, etc. In equal temperament the interval of the half step is constant; in just intonation and other temperaments half steps can vary widely.

Smallest interval used in the Western system, the octave divides into twelve such intervals; on the piano, the distance between any two adjacent keys, whether black or white. Also semitone.

A pitch difference of the amount that is present between adjacent keys on a piano.

Used to define the distance between a note that is one fret away from another note, ascending or descending i.e. equal in distance of B to C (ascending) or C to B (descending).

an incomplete step forward or backward

The distance from one key to the very closest key on the keyboard (Ex. C-C#, or E-F).

The smallest recognized interval in Western music. The distance represented by one fret on a guitar is a half step.

The distance between one key and the next adjacent key of the piano keyboard, including all black and white keys. It is also called an Interval of a Minor Second.

The smallest interval on the standard keyboard. The interval between two adjacent keys (incl. both black and white keys) is a half step.