Elocution is the study of formal speaking in pronunciation

Pronunciation

Pronunciation refers to the way a word or a language is spoken, or the manner in which someone utters a word. If one is said to have "correct pronunciation", then it refers to both within a particular dialect....

, grammar

Grammar

In linguistics, grammar is the set of structural rules that govern the composition of clauses, phrases, and words in any given natural language. The term refers also to the study of such rules, and this field includes morphology, syntax, and phonology, often complemented by phonetics, semantics,...

, style, and tone

Tone (linguistics)

Tone is the use of pitch in language to distinguish lexical or grammatical meaning—that is, to distinguish or inflect words. All verbal languages use pitch to express emotional and other paralinguistic information, and to convey emphasis, contrast, and other such features in what is called...

.
In Western classical rhetoric

Rhetoric

Rhetoric is the art of discourse, an art that aims to improve the facility of speakers or writers who attempt to inform, persuade, or motivate particular audiences in specific situations. As a subject of formal study and a productive civic practice, rhetoric has played a central role in the Western...

, elocution was one of the five core disciplines of pronunciation

Pronunciation

Pronunciation refers to the way a word or a language is spoken, or the manner in which someone utters a word. If one is said to have "correct pronunciation", then it refers to both within a particular dialect....

, which was the art of delivering speeches. Orators were trained not only on proper diction

Diction

Diction , in its original, primary meaning, refers to the writer's or the speaker's distinctive vocabulary choices and style of expression in a poem or story...

, but on the proper use of gestures, stance, and dress. (Another area of rhetoric, elocutio

Elocutio

Elocutio is the term for the mastery of stylistic elements in Western classical rhetoric and comes from the Latin loqui, "to speak". Although today we associate the word elocution more with eloquent speaking, for the classical rhetorician it connoted "style".It is the third of the five canons of...

, was unrelated to elocution and, instead, concerned the style of writing proper to discourse.)

Elocution emerged as a formal discipline during the eighteenth century.