Etymology
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dentiloquy (n.)

"act or practice of speaking through the teeth or with the teeth closed," 1737, from Latin dens (genitive dentis) "tooth" (from PIE root *dent- "tooth") + -loquy, from Latin loqui "to speak" (from PIE root *tolkw- "to speak"). Related: Dentiloquist.

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interlocutor (n.)
1510s, "one who speaks in a dialogue or conversation," agent noun from Latin interlocut-, past participle stem of interloqui "speak between; interrupt," from inter "between" (see inter-) + loqui "to speak" (from PIE root *tolkw- "to speak").

In minstrel shows, the name of a straight-man character (1870) who was the questioner of the end men. Related: Interlocutory. Fem. forms include interlocutress (1858), interlocutrix (1846), interlocutrice (1848).
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elocution (n.)

mid-15c., elocucioun, "oratorical or literary style," from Late Latin elocutionem (nominative elocutio) "voice production, a speaking out, utterance, manner of expression," in classical Latin especially "rhetorical utterance, oratorical expression," noun of action from past-participle stem of eloqui "to speak out," from ex "out" (see ex-) + loqui "to speak" (from PIE root *tolkw- "to speak"). Related: Elocutionary; elocutionist.

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defame (v.)
Origin and meaning of defame

"speak evil of, maliciously speak or write what injures the reputation of," c. 1300, from Old French defamer (13c., Modern French diffamer), from Medieval Latin defamare, from Latin diffamare "to spread abroad by ill report, make a scandal of," from dis-, here probably suggestive of ruination, + fama "a report, rumor" (from PIE root *bha- (2) "to speak, tell, say"). Related: Defamed; defaming.

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colloquy (n.)

mid-15c., "a discourse," from Latin colloquium "conference, conversation," literally "a speaking together," from assimilated form of com "together" (see com-) + -loquium "speaking," from loqui "to speak" (from PIE root *tolkw- "to speak"). Meaning "conversation" is attested in English from 1580s.

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locution (n.)

"style of speech," early 15c., from Latin locutionem (nominative locutio) "a speaking, speech, discourse; way of speaking," noun of action from past-participle stem of loqui "to speak," from PIE root *tolkw- "to speak." Related: Locutionary.

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cant (v.1)
1560s, "to speak in a whining voice," from cant (n.1). From c. 1600 as "to speak in the jargon of thieves and vagabonds;" 1670s as "talk hypocritically in pompous phraseology." Related: Canted; canting.
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muteness (n.)

"dumbness, forbearance from speaking or inability to speak," 1580s, from mute (adj.) + -ness.

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mouth (v.)

early 14c., "to speak," from mouth (n.). Related: Mouthed; mouthing. Old English had muðettan "to blab." In 17c.-18c. especially "to speak pompously or affectedly." Meaning "form the shape of words with the mouth without uttering them" is by 1953.

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blandiloquence (n.)
"flattery in speech," 1650s, from Latin blandiloquentia, from blandiloquens "speaking flatteringly," from blandus "flattering, alluring" (see bland) + loquens, from loqui "to speak" (from PIE root *tolkw- "to speak"). Blandiloquous is attested earlier (1610s). Latin also had blandiloquentulus "flattering in speech."
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