Editing Diminished triad (section)

{{Short description|Two minor thirds above the root}}
{{redirect|Diminished chord|the seventh chord|Diminished seventh chord}}
{{Infobox chord|
chord_name=diminished triad|
first_interval=[[root (chord)|root]]|
second_interval=[[minor third]]|
third_interval=[[tritone|diminished fifth]] ([[tritone]])|
tuning=[[just intonation|45:54:64]];<ref name="Shirlaw">Shirlaw, Matthew (2012). ''The Theory of Harmony'', p. 304. Forgotten Books. {{ISBN|978-1-4510-1534-8}}.</ref> 54:45=[[just minor third|6:5]] & [[just tritone|64:45]]<ref>[[Harry Partch|Partch, Harry]] (1979). ''[[Genesis of a Music]]'', pp. 68–69. {{ISBN|978-0-306-80106-8}}.</ref>|
forte_number=3-10|
complement=9-10
}}In [[music theory]], a '''diminished triad''' is a [[triad (music)|triad]] consisting of two [[minor third]]s above the [[root (chord)|root]].<ref>{{cite book|last1=Benward|last2=Saker|date=2003|title=Music: In Theory and Practice, Vol. I|page=68|publisher=McGraw-Hill |edition=7th|isbn=978-0-07-294262-0}}</ref> It is a [[Minor chord|minor triad]] with a lowered ([[flat (music)|flattened]]) [[Fifth (chord)|fifth]].  When using [[Chord names and symbols (popular music)|chord symbols]], it may be indicated by the symbols "dim", "{{music|diminished}}", "m<sup>{{music|flat}}5</sup>", or "<small>MI</small><sup>({{music|b}}5)</sup>".<ref>Benward & Saker (2003), p.77.</ref> However, in most popular-music chord books, the symbol "dim" or "{{music|diminished}}" represents a [[diminished seventh chord]] (a four-tone chord), which in some modern jazz books and music theory books is represented by the "dim7" or "{{music|diminished}}<sup>7</sup>" symbols. 

For example, the diminished triad built on B, written as B{{music|diminished}}, has pitches B-D-F:

:<score sound="1">
{ \omit Score.TimeSignature \relative c' { <b d f>1 } }
</score>

The chord can be represented by the [[Pitch class#Integer notation|integer notation]] {0,&nbsp;3,&nbsp;6}.

In the [[common practice period]], the diminished triad is considered [[Consonance and dissonance|dissonant]] because of the [[Tritone|diminished fifth]] (or tritone).