1. etiology

noun. (ˌiːtiːˈɑːlədʒi, ˌiːˌtiːˈɑːlədʒi) The cause of a disease.
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2. etiology

noun. (ˌiːtiːˈɑːlədʒi, ˌiːˌtiːˈɑːlədʒi) The philosophical study of causation.