Webster's Online Dictionary
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Definition: ELECTRO-DYNAMICS

Part of Speech Definition
Noun 1. The phenomena of electricity in motion.[Websters]
2. The branch of science which treats of the properties of electric currents; dynamical electricity.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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

Definition: ELECTRO-DYNAMICS

Part of SpeechDefinition
Noun1. The phenomena of electricity in motion.[Websters]
2. The branch of science which treats of the properties of electric currents; dynamical electricity.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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