What term describes the characteristic of following rules of syntax?

The term that describes the characteristic of following rules of syntax is "syntactically." This term specifically relates to the set of rules, principles, and processes that govern the structure of sentences in a given language, whether it's natural language or a programming language. In programming, adhering to syntactical rules ensures that the code is written in a way that the compiler or interpreter can understand, allowing for proper execution of the program.

Other terms, while relevant to different aspects of language and programming, do not directly refer to the rules of syntax. For instance, "lexically" pertains to the vocabulary and the arrangement of symbols (tokens) in a programming language, but it does not focus on the structural composition of those symbols in forming correct statements. "Functionally" relates to the functionality of code and how it performs actions rather than on syntax. "Structurally" hints at the organization of components within a system but again, it does not specifically address the rules governing syntax. Thus, "syntactically" is the most accurate term to describe the adherence to rules of syntax.