1540s, "group or set of three," from Late Latin trias (genitive triadis), from Greek trias (genitive triados) "a triad, the number three," from treis "three" (see three). Musical sense of "chord of three notes" is from 1801. Related: Triadic.
triad 英文释义
1. the cardinal number that is the sum of one and one and one
2. a set of three similar things considered as a unit
3. three people considered as a unit
4. a 3-note major or minor chord; a note and its third and fifth tones
triad 双语例句
1. Self - knowledge in this case a perspective on the entire triad.