Etymology
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pneumonia (n.)

"inflammation of the tissues of the lungs" (as distinct from the bronchial tubes or the serous covering of the lungs), c. 1600, from Modern Latin, from Greek pneumonia "inflammation of the lungs," from pneumōn "lung" (see pneumo-).

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Definitions of pneumonia

pneumonia (n.)
respiratory disease characterized by inflammation of the lung parenchyma (excluding the bronchi) with congestion caused by viruses or bacteria or irritants;
From wordnet.princeton.edu