List of third intervals

Third interval may refer to one of the following musical intervals in equal-temperament tuning:

Alternatively, it may apply to

Table of thirds in equal temperaments tuning

Number of semitones	Minor, major, or perfect intervals	Short	Augmented or diminished intervals	Short	Widely used alternative names	Short
2	Major second	M2	Diminished third	d3	Tone, whole tone, whole step¹	T¹
3	Minor third	m3	Augmented second	A2
4	Major third	M3	Diminished fourth	d4
5	Perfect fourth	P4	Augmented third	A3

The terms tone, whole tone, and whole step refer only to major seconds (M2)

References

Duckworth, William (2007). A Creative Approach to Music Fundamentals (ninth ed.). Thomson Schirmer. ISBN 978-0-495-09093-9.
Kostka, Stefan; Payne, Dorothy; Almén, Byron (2013). Tonal Harmony with an Introduction to Twentieth-century Music (seventh ed.). New York: McGraw-Hill. ISBN 978-0-07-131828-0.