triad

UK:^*^*UK and possibly other pronunciationsUK and possibly other pronunciations'triad', 'Triad': /ˈtraɪæd/

US:USA pronunciation: IPAUSA pronunciation: IPA/ˈtraɪæd, -əd/

US:USA pronunciation: respellingUSA pronunciation: respelling(trī′ad, -əd)

tri•ad n. [countable]

tri•ad•ic, adj.

tri•ad n.

a group of three, esp. of three closely related persons or things.
[Chem.]
- an element, atom, or group having a valence of three. Cf. monad (def. 2), dyad (def. 3).
- a group of three closely related compounds or elements, as isomers or halides.
[Music.]a chord of three tones, esp. one consisting of a given tone with its major or minor third and its perfect, augmented, or diminished fifth.
Military([cap.]) the three categories of strategic-nuclear-weapons delivery systems: bombers, land-based missiles, and missile-firing submarines.

tri•ad ′ic, adj.
tri ′ad•ism, n.

Collins Concise English Dictionary © HarperCollins Publishers::

triad /ˈtraɪæd/ n

a group of three; trio
an atom, element, group, or ion that has a valency of three
a three-note chord consisting of a note and the third and fifth above it
an aphoristic literary form used in medieval Welsh and Irish literature
the US strategic nuclear force, consisting of intercontinental ballistic missiles, submarine-launched ballistic missiles, and bombers

Etymology: 16th Century: from Late Latin trias, from Greek; related to Greek treis threetriˈadic adj ˈtriadism n

Collins Concise English Dictionary © HarperCollins Publishers::

Triad /ˈtraɪæd/ n

any of several Chinese secret societies, esp one involved in criminal activities, such as drug trafficking

'triad' also found in these entries (note: many are not synonyms or translations):

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