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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.
If you have an illness, there is something wrong with your health. An illness can last for a long time or a short time, and its effects can be serious or not serious. The doctor thought that Bae's illness was caused by stress. You can use the adjectives long and short in front of illness, but not in front of disease. He died last month after a long illness. 2. 'disease'. A disease is a particular kind of illness caused by bacteria or an infection. Diseases can often be passed from one person to another. Glaucoma is an eye disease. Children should be immunised against dangerous diseases. Animals and plants can also have diseases, but not illnesses.