Trigrammatic refers to something that is made up of or related to three letters or symbols. Some synonyms for the word trigrammatic include trigrammatical, triadic, tripartite, ternary, and triple. These terms all suggest the same concept of threefold structure or division. Trigrammatic can be used to describe various things, such as a type of writing system that uses three-letter symbols, a language that emphasizes three-letter combinations, or a mathematical concept that involves three variables. No matter the usage, trigrammatic has a specific connotation that implies a triple aspect that is present, repeated or required.