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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.
A disease is a particular abnormal condition, a disorder of a structure or function, that affects part or all of an organism. The causal study of disease is called pathology.edical therapies or treatments are efforts to cure or improve a disease or other health problem. In the medical field, therapy is synonymous with the word treatment. Among psychologists, the term may refer specifically to psychotherapy or talk therapy.