vociferate

tr. & intr.v., -at·ed, -at·ing, -ates.
To utter (something) or cry out loudly and vehemently, especially in protest.

[Latin vōciferārī, vōciferāt-, from *vōcifer, carrying the voice : vōx, vōc-, voice; see voice + -fer; see -fer.]

vociferation vo·cif'er·a'tion n.
vociferator vo·cif'er·a'tor n.

verb

To speak or say very loudly or with a shout: bawl, bellow, bluster, call, clamor, cry, halloo, holler, roar, shout, whoop, yawp, yell. See sounds/pleasant sounds/unpleasant sounds/neutral sounds or silence.

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The verb has one meaning:

Meaning #1: utter in a very loud voice
  Synonym: shout out

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