Rhetoric

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noun: rhetoric
  1. the art of effective or persuasive speaking or writing, especially the exploitation of figures of speech and other compositional techniques.
    “he is using a common figure of rhetoric, hyperbole”
    synonyms: oratoryeloquence, power of speech, command of language, expression, way with words, deliverydiction

    “he was considered to excel in this form of rhetoric”
    • language designed to have a persuasive or impressive effect, but which is often regarded as lacking in sincerity or meaningful content.
      “all we have from the Opposition is empty rhetoric”
      synonyms: bombast, loftiness, turgidity, grandiloquence, magniloquence, ornateness, portentousness, pomposity, boastfulness, boasting, bragging, heroics, hyperbole, extravagant language, purple prose, pompousness, sonorousness; More

Origin
Middle English: from Old French rethorique, via Latin from Greek rhētorikē (tekhnē) ‘(art) of rhetoric’, from rhētōr ‘rhetor’.