Definition of Syntagmatic: The words which follow the chain of command in a sentence are called syntagmatic. It is the major part of linguistics. It helps us to design a sentence and make it strong.
Denoting the relationship between two or more linguistic units used sequentially to make well-formed structures may be considered as syntagmatic. The identity of a linguistic unit within a language is described by a combination of its syntagmatic and its paradigmatic relations.
For example, I go to school. The sentence is designed with a chain of command because if we write ‘go I school to’ the sentence will not correct because there is no chain of command in this sentence.