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1. An indication of a disorder or disease, especially a subjective one such as pain, nausea, or weakness.
2. A characteristic sign or indication of the existence of something else: drought and erratic rainfall as symptoms of climate change.
[Middle English sinthoma, symptom of a disease, from Medieval Latin sinthōma, from Late Latin symptōma, from Greek sumptōma, sumptōmat-, a happening, symptom of a disease, from sumpiptein, sumptō-, to coincide : sun-, syn- + piptein, to fall; see pet- in Indo-European roots.]