from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A group of three.
- n. Music A chord of three tones, especially one built on a given root tone plus a major or minor third and a perfect fifth.
- n. A section of a Pindaric ode consisting of the strophe, antistrophe, and epode.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A grouping of three.
- n. A chord consisting of a root tone, the tone two degrees higher, and the tone four degrees higher in a given scale.
- n. on a CRT display, a group of three neighbouring phosphor dots, coloured green, red, and blue.
- n. A branch of a Chinese underground criminal society, mostly based in Hong Kong.
from the GNU version of the Collaborative International Dictionary of English
- n. A union of three; three objects treated as one; a ternary; a trinity.
- n. A chord of three notes.
- n. The common chord, consisting of a tone with its third and fifth, with or without the octave.
- n. An element or radical whose valence is three.
from The Century Dictionary and Cyclopedia
- n. plural See the Triad Society.
- n. A union or conjunction of three; a group or class of three persons or things closely related; a trinity.
- n. In chem., an element or radical which will combine with three atoms of a monad element or radical; a trivalent element or radical.
- n. In music, a chord of three tones, including a given tone with its major or minor third and its perfect, augmented, or diminished fifth. A triad is named from the given tone or root: as, triad of G; dominant triad. See chord, 4. Also trias.
- n. In Welsh lit., a form of composition characterized by the arrangement of the contents in groups of three.
- n. In mythology, an intimate association of three kindred or correlated deities, sometimes considered as having the relationship of father, mother, and child, and forming a characteristic conception in some religious systems, as that of ancient Egypt.
- n. In morphology, a tertiary unit of organization resulting; from integration of an aggregate of dyads. See dyad, 3.
- n. An indeterminate product of three vectors.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. three people considered as a unit
- n. a three-note major or minor chord; a note and its third and fifth tones
- n. a set of three similar things considered as a unit
- n. the cardinal number that is the sum of one and one and one
Late Latin trias, triad-, from Greek, the number three; see trei- in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin triad-, stem of trias ("three, triad"), from Ancient Greek τριάς (trias); applied by British authorities to underground society in Hong Kong based on geometry of Chinese character. (Wiktionary)