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The best-known type of triad is a type of musical chord consisting of three notes. A D-major triad is made up of the notes D, F-sharp, and A; an F-minor triad is made up of F, A-flat, and C; and so on. Major and minor triads form the basis of tonal music, and songs and other pieces usually end with a triadic harmony. In medicine, a triad is a set of three symptoms that go together. The Chinese criminal organizations called triads got their name from the triangular symbol that they used back when they began, centuries ago, as patriotic organizations. Today, with over 100,000 members, the triads operate in the U.S., Canada, and many other countries.
Examples of triad in a Sentence
Brooke Taylor, Boston Herald, 24 July 2025
Quantum technology, in particular, forms one part of a new strategic triad, alongside AI and cyber resilience, that will determine global influence for decades.
—Markus Pflitsch, Forbes.com, 24 June 2025
In the medium term, the U.S. Strategic Modernization Program—which was first outlined by the Obama administration and which will modernize all three legs of the nuclear triad—should be expanded to more accurately respond to the current nuclear landscape.
—Eric S. Edelman, Foreign Affairs, 3 June 2025
Only the first and last chords in the sequence are solid triads, the rest tinged by dissonance to one degree or another.
—Alex Ross, New Yorker, 23 June 2025
See All Example Sentences for triad
Cite this Entry
“Triad.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/triad. Accessed 5 Aug. 2025.
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triad
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Medical Definition
triad
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