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Major second

In Western music theory, a major second is a second spanning two semitones. A second is a musical interval encompassing two adjacent staff positions. For example, the interval from C to D is a major second, as the note D lies two semitones above... Wikipedia
12-Tone equal temperament: 200
Abbreviation: M2
Just intonation: 204 or 182
Other names: whole tone, whole step
Semitones: 2