Which of the following terms describes language as it is ordinarily spoken, used for everyday communication and is found in textbooks and reports?

Prose is the term that precisely describes language as it is ordinarily spoken and used for everyday communication. It is characterized by a straightforward and natural flow of words, making it appropriate for conveying information clearly and effectively. Prose is commonly found in textbooks, reports, novels, and essays, where the focus is on the clarity of the message rather than on rhythmic or structured forms of writing.

Poetry, in contrast, is typically more stylized and often employs meter, rhyme, and other aesthetic devices to evoke emotions or paint vivid imagery. Dialogue refers specifically to the spoken exchanges between characters in a narrative, which may not necessarily reflect ordinary spoken language. Discourse encompasses a broader concept of communication, including spoken or written language in context, but it isn't limited to the regular, everyday form of language that prose represents. Thus, prose is the most fitting term among the choices provided for describing ordinary, everyday communication found in many written works.