Webster's Online Dictionary
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Definition: AITIOLOGY

Part of Speech Definition
Noun 1. An alternative spelling for "Aetiology": The science, doctrine, or demonstration of causes; esp., the investigation of the causes of any disease; the science of the origin and development of things.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Date "Aitiology" was first used in popular English literature: sometime before 1914. (references)

Definition: AITIOLOGY

Part of SpeechDefinition
Noun1. An alternative spelling for "Aetiology": The science, doctrine, or demonstration of causes; esp., the investigation of the causes of any disease; the science of the origin and development of things.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Date "AITIOLOGY" was first used in popular English literature: sometime before 1914. (references)