eloquence -
powerful and effective language; "his eloquence attracted a large congregation"; "fluency in spoken and written English is essential"; "his oily smoothness concealed his guilt from the police"
expressive style,
style a way of expressing something (in language or art or music etc.) that is characteristic of a particular person or group of people or period; "all the reporters were expected to adopt the style of the newspaper"
Eloquence is fluent, forcible, elegant or persuasive speaking. It is primarily the power of expressing strong emotions in striking and appropriate language, thereby producing conviction or persuasion. The term is also used for writing in a fluent style.
OmegaWiki Dictionary
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Eloquence Fluent, forcible, elegant or persuasive speaking in public.
