Other forms: vociferated; vociferating; vociferates
To vociferate is to shout, wail, or yell loudly and vehemently. People vociferate when they want to be heard.
Vociferating is a fancy word for shouting. During a chase, a police officer might vociferate, "Stop!" In sports, coaches are often seen vociferating at referees to protest a bad call. While parents might vociferate when a child is in danger or misbehaving, the word implies a loud, forceful outcry rather than just talking loudly. Because it involves being loud and making a scene, you should never vociferate in a quiet place like a library or a theater — unless there's an emergency.