Etymology
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magniloquence (n.)

"exaggerated eloquence, loftiness of speech or expression," 1620s, from Latin magniloquentia "elevated language, lofty style," from magniloquus "pompous in talk, vaunting, boastful," from combining form of magnus "great" (from PIE root *meg- "great") + -loquus "speaking," from loqui "to speak" (from PIE root *tolkw- "to speak").

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*tolkw- 
Proto-Indo-European root meaning "to speak."

It forms all or part of: circumlocution; colloquium; colloquy; elocution; eloquence; grandiloquence; interlocution; interlocutor; locution; locutory; loquacious; loquacity; loquitur; magniloquence; magniloquent; obloquy; soliloquy; somniloquy; vaniloquence; ventriloquism; ventriloquy.

It is the hypothetical source of/evidence for its existence is provided by: Latin loqui "to speak;" Old Irish ad-tluch- "to thank," to-tluch- "to ask;" Old Church Slavonic tloko "interpretation, explanation."
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*meg- 
Proto-Indo-European root meaning "great."

It forms all or part of: acromegaly; Almagest; Charlemagne; maestro; magisterial; magistral; magistrate; Magna Carta; magnate; magnitude; magnum; magnanimity; magnanimous; magni-; Magnificat; magnificence; magnificent; magnify; magniloquence; magniloquent; Magnus; maharajah; maharishi; mahatma; Mahayana; Maia; majesty; major; major-domo; majority; majuscule; master; maxim; maximum; may (v.2) "to take part in May Day festivities;" May; mayor; mega-; megalo-; mickle; Mister; mistral; mistress; much; omega.

It is the hypothetical source of/evidence for its existence is provided by: Armenian mets "great;" Sanskrit mahat- "great, mazah- "greatness;" Avestan mazant- "great;" Hittite mekkish "great, large;" Greek megas "great, large;" Latin magnus "great, large, much, abundant," major "greater," maximus "greatest;" Middle Irish mag, maignech "great, large;" Middle Welsh meith "long, great."
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magniloquent (adj.)

"lofty or ambitious in expression," 1650s, a back-formation from magniloquence, or else from Latin magniloquentia "lofty style of language," from magniloquus "pompous in talk, vaunting, boastful," from combining form of magnus "great" (from PIE root *meg- "great") + -loquus "speaking," from loqui "to speak" (from PIE root *tolkw- "to speak"). Related: Magniloquently.

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