Tagmeme is a linguistic term that represents the smallest unit of meaning in a language. The concept originated from the work of American linguist Kenneth L. Pike, who used it to describe the relationship between grammatical categories and meaning in a language. Although tagmeme is a specific term, there are other synonyms that refer to the same idea, such as morpheme, lexeme, and word. Morpheme is a unit of meaning that cannot be broken down into smaller parts, while lexeme represents a word's form and meaning. On the other hand, a word is the most common unit of meaning that people use in their communication.