trigram noun. ['trʌɪgram] E17.
[from TRI- + -GRAM. Cf. DIGRAM, MONOGRAM.]
1. A group of three letters, a trigraph; Psychology a (nonsense) word of three letters used in the study of learning or memory. E17.

2. A three-stroke figure or character; spec. each of eight figures composed of three whole or broken parallel lines, occurring with sixty-four hexagrams in the ancient Chinese text I Ching, and traditionally used for divination. E17.

3. Geometry etc. A set of three lines; spec. the figure formed by three straight lines in one plane not intersecting in the same point. Also more generally, any figure composed of three elements. E17.

■ trigra'mmatic adjective (rare) of, pertaining to, or of the nature of a trigram E19.

[TahlilGaran] English Dictionary ▲