Definition of "trigram" [tri•gram]

• A figure composed of three solid or interrupted parallel lines, especially as used in Chinese philosophy or divination according to the I Ching. (noun)
• See trigraph. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "A trigram is a combination of three lines, solid or broken, as found in the Chinese classic I Ching (The Book of Changes)."
• "Everyone of the same gender has the same progressed trigram for the same age."
• "The natal trigram, then, for both males and females is not calculated from their years of birth, but rather is taken as their mother's progressed trigram for her age at the year she gave birth to them."