Influenza definitions

ĭn'flo͝o-ĕn'zə
An acute contagious viral infection of humans, characterized by inflammation of the respiratory tract and by fever, chills, muscular pain, and prostration.
noun
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An acute, contagious, infectious disease, caused by any of various viruses and characterized by inflammation of the respiratory tract, fever, and muscular pain.
noun
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Any of various viral infections of domestic or wild animals, generally characterized by fever and respiratory involvement.
noun
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Any of various viral diseases of domestic animals, characterized by inflammation of the respiratory tract.
noun
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An acute contagious viral infection of humans, characterized by inflammation of the respiratory tract and by fever, chills, muscular pain, and prostration.
noun
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Any of various viral infections of domestic or wild animals, generally characterized by fever and respiratory involvement.
noun
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A highly contagious infectious disease that is caused by any of various viruses of the family Orthomyxoviridae and is characterized by fever, respiratory symptoms, fatigue, and muscle pain. It commonly occurs in epidemics, one of which killed 20 million people between 1917 and 1919.
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(pathology) An acute contagious disease of the upper airways and lungs, caused by a virus, which rapidly spreads around the world in seasonal epidemics.
noun
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Origin of influenza

Italian from Medieval Latin īnfluentia influence (so called apparently from the belief that epidemics were due to the influence of the stars) influence