Etiology (alternately "aetiology") is the study of causation. In medicine it specifically refers to the causation of diseases or pathologies. The term is also used in philosophy, physics and biology in reference to the causes of various phenomena.
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... a female householder with no husband present, and 30.7% are non-families. 22.6% of all households are made up of individuals and 8.2% have someone living alone who is 65 ...