Which term describes the principles governing the art of writing effectively, eloquently, and persuasively?

The term that best describes the principles governing the art of writing effectively, eloquently, and persuasively is rhetoric. Rhetoric encompasses the strategies and techniques employed in communication to persuade or inform an audience. It involves understanding and using language skillfully to achieve a desired effect on the reader or listener. Through the use of rhetorical devices, such as ethos, pathos, and logos, a writer can enhance their argument and engage their audience more deeply.

While elocution pertains to the clear and expressive speech or presentation of language, its primary focus is on verbal delivery rather than the principles of writing. Composition refers to the act of writing and organizing content, but it does not specifically address the persuasive aspects that rhetoric encompasses. Syntax deals with the structure of sentences and the arrangement of words, which is an important component of grammar but does not cover the broader principles of persuasive writing. Thus, rhetoric stands out as the most suitable term for describing the art of crafting effective communication.