Noun
Lydian mode
(music) a mode whose scale is the same as a major key with the fourth scale degree raised by one half step, with the interval pattern:
tone - tone - tone - semitone - tone - tone - semitone.
Starting on the note C, this produces a scale with the notes C, D, E, F♯, G, A, B, C.
Lydian (IV) Lydian mode on F About this sound Play ( help · info ) Lydian is the fourth mode. Source: Internet
Scales in the Lydian mode ( About this sound listen ( help · info ) ) are major scales with the subdominant (fourth scale degree) raised by a semitone. Source: Internet