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disease (n.)

early 14c., "discomfort, inconvenience, distress, trouble," from Old French desaise "lack, want; discomfort, distress; trouble, misfortune; disease, sickness," from des- "without, away" (see dis-) + aise "ease" (see ease (n.)). Restricted pathological sense of "sickness, illness" in English emerged by late 14c.; the word still sometimes was used in its literal sense early 17c., and was somewhat revived 20c., usually with a hyphen (dis-ease).

disease (v.)

mid-14c., disesen, "to make uneasy, trouble; inflict pain," a sense now obsolete; late 14c. as "to have an illness or infection;" late 15c. in the transitive sense of "to infect with a disease, make ill;" from disease (n.). Tyndale (1526) has Thy doughter is deed, disease not the master where KJV has trouble not (Luke viii.49).

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Definitions of disease from WordNet

disease (n.)
an impairment of health or a condition of abnormal functioning;
From wordnet.princeton.edu