1. etiology

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

2. etiology

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