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From The Collaborative International Dictionary of English v.0.48:
outbreak \out"break`\, n. 1. A bursting forth; eruption; insurrection; mutiny; revolt. "Mobs and outbreaks." --J. H. Newman. [1913 Webster] The flash and outbreak of a fiery mind. --Shak. [1913 Webster] 2. A sudden beginning of a violent event; as, the outbreak of hostilities between ethnic groups. [PJC] 3. A sudden occurrence or manifestation; -- usually of disease or emotion, in one person or a group; as, an outbreak of measles among the students; he had an outbreak of shingles; an outbreak of nervousness in the mob. [PJC]