also: major scale or major mode
noun
A diatonic scale also called the major scale. The intervals pattern of the Ionian mode goes as follows:
W W S W W W S
W - a whole tone
S - a semitone
The Ionian mode played on a piano
See also: Aeolian mode, Dorian mode, Lydian mode, Mixolydian mode, Phrygian mode