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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
Ajith Sankaran, Forbes.com, 26 June 2025
To avoid the looming launcher cliff in the crucial sea component of its nuclear triad, however, the United States must build a larger number of Columbia-class submarines in the 2040s and beyond—at least 14, and perhaps more, to hedge against the further growth of adversaries’ arsenals.
—Vipin Narang, Foreign Affairs, 24 June 2025
This principle is widely used in communication, marketing, and leadership because information presented in triads is easier to process and recall.
—Scott Hutcheson, Forbes, 17 Mar. 2025
Those capabilities are threefold, and they are known as the nuclear triad.
—Brett Tingley, Space.com, 21 May 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 1 Jul. 2025.
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triad
noun
Medical Definition
triad
noun
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