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Wiktionary (0.00 / 0 votes) Rate this definition: disease (Noun). An abnormal condition of the body or mind that causes discomfort or dysfunction; distinct from injury insofar as the latter is usually instantaneously acquired. The tomato plants had some kind of disease that left their leaves splotchy and fruit withered. disease (Noun). Any abnormal or harmful condition, as of society, people's attitudes, way of living etc. disease (Verb). To cause unease; to annoy, irritate. disease (Verb). To infect with a disease.
Chronic disease: A disease that persists for a long time. A chronic disease is one lasting 3 months or more, by the definition of the U.S. National Center for Health Statistics. Chronic diseases generally cannot be prevented by vaccines or cured by medication, nor do they just disappear.