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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.
mental illness noun. [uncountable] the state of feeling ill or of having a disease He missed five days of school because of illness. patients who are recovering from major surgery or serious illness. Synonyms and related words. General words for illnesses, diseases and medical conditions:illness, disease, sickness... Explore Thesaurus. a. [countable] a particular disease, or a period of being ill She had had no serious illnesses, and had never been in hospital.