Etymology
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Words related to *neu-

announce (v.)
c. 1500, "proclaim, make known formally," from Old French anoncier "announce, proclaim" (12c., Modern French annoncer), from Latin annuntiare, adnuntiare "to announce, make known," literally "bring news to," from ad "to" (see ad-) + nuntiare "relate, report," from nuntius "messenger" (from PIE root *neu- "to shout"). Related: Announced; announcing.
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denounce (v.)

early 14c., "announce, make known in a formal manner" (a sense now obsolete), from Old French denoncier (12c., Modern French dénoncer) and directly from Latin denuntiare "to announce, proclaim; denounce, menace; command, order," from de- "down" + nuntiare "proclaim, announce," from nuntius "messenger" (from PIE root *neu- "to shout").

The negative sense in English developed (probably encouraged by other words in de-) via the meanings "proclaim as cursed, excommunicated, removed from office" (early 14c.); "formally or publicly threaten to do" (1630s); "declare or proclaim to be cursed, wicked, or evil" (1660s). The meaning "make formal or public accusation against, inform against, accuse" (especially in turning on one's co-conspirators) is from late 15c. Related: Denounced; denouncing.

enunciate (v.)
1620s, "declare, express," from Latin enunciatus, properly enuntiatus, past participle of enuntiare "speak out, say, express, assert; divulge, disclose, reveal, betray," from assimilated form of ex "out" (see ex-) + nuntiare "to announce," from nuntius "messenger" (from PIE root *neu- "to shout"). Or perhaps a back-formation from enunciation. Meaning "to articulate, pronounce" is from 1759. Related: Enunciated; enunciating.
nuncio (n.)

"papal envoy, permanent diplomatic agent representing the Pope at a national capital," 1520s, from older Italian nuncio (now nunzio), from Latin nuntius "messenger," from PIE root *neu- "to shout."

pronounce (v.)

mid-14c., pronouncen, "to declare officially, proclaim, announce;" late 14c., "to speak, utter" (words, a language, etc.), "form or articulate with the organs of speech," from Old French prononcier "declare, speak out, pronounce" (late 13c., Modern French prononcer) and directly from Late Latin pronunciare, from Latin pronuntiare "to proclaim, announce; pronounce, utter," from pro "forth, out, in public" (see pro-) + nuntiare "announce," from nuntius "messenger" (from PIE root *neu- "to shout").

With reference to the mode of sounding words or languages, it is attested by 1610s (pronunciation in the related sense is attested from early 15c.). Meaning "make a statement," especially authoritative one (as in pronounce judgment) is from early 15c. Related: Pronounced; pronouncing.

renounce (v.)

late 14c., renouncen, "give up (something, especially to another), resign, surrender," from Old French renoncier "give up, cede" (12c., Modern French renoncer) and directly from Latin renuntiare "bring back word; proclaim; protest against, renounce," from re- "against" (see re-) + nuntiare "to report, announce," from nuntius "messenger" (from PIE root *neu- "to shout").

The sense of "abandon, discontinue" (a habit, practice, etc.) is from late 15c.. That of "disclaim relationship with or allegiance to" a person is by c. 1500. That of "to abandon or give up" a belief, opinion, etc. by open recantation, declare against" is from 1530s. Related: Renounced; renouncing; renouncement.

Renounce, to declare strongly, with more or less of formality, that we give up some opinion, profession, or pursuit forever. Thus, a pretender to a throne may renounce his claim. Recant, to make publicly known that we give up a principle or belief formerly maintained, from conviction of its erroneousness ; the word therefore implies the adoption of the opposite belief. [Century Dictionary]
denunciation (n.)

early 15c., denunciacioun, "act of declaring or stating something" (a sense now obsolete), from Latin denunciacionem / denuntiationem (nominative denuntiatio), noun of action from past-participle stem of denuntiare "to announce, proclaim; denounce, menace; command, order," from de "down" (see de-) + nuntiare "proclaim, announce," from nuntius "messenger" (from PIE root *neu- "to shout"). Meaning "a charge, a solemn or formal declaration accompanied by a menace" is mid-15c.

interneuron (n.)
1939, from neuron + first element from internuncial (adj.) "communicating between different parts of the body," from Latin internuncius "a messenger, mediator," from inter "between" (see inter-) + nuntius "messenger" (from PIE root *neu- "to shout").