Webster's Online Dictionary
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Definition: DIPHTHONGATION

Part of Speech Definition
Noun 1. An alternative spelling for "Diphthongization": The act of changing into a diphthong.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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

Definition: DIPHTHONGATION

Part of SpeechDefinition
Noun1. An alternative spelling for "Diphthongization": The act of changing into a diphthong.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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