Definitions
from The Century Dictionary.
 noun That part of the science of electricity which treats of the mutual action of electric currents and of currents and magnets.
from the GNU version of the Collaborative International Dictionary of English.
 noun The phenomena of electricity in motion.
 noun The branch of science which treats of the properties of electric currents; dynamical electricity.
Etymologies
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Examples

This method is physically based on the wellknown principles of the classical physics (mechanics, thermodynamics and electrodynamics).
“Black Holes – a Simplified Theory for Quantum Gravity NonSpecialists”

This method is physically based on the wellknown principles of the classical physics (mechanics, thermodynamics and electrodynamics).

This method is physically based on the wellknown principles of the classical physics (mechanics, thermodynamics and electrodynamics).

The special relativity theory which was simply a systematic extension of the electrodynamics of Maxwell and Lorentz, had consequences which reached beyond itself.

Beginning with Arago's and Faraday's discoveries he developed by ingenious experiments our knowledge of electrostatics, electrodynamics, induced currents, and the like, but his greatest achievements however were in the field of electrophysiology, with frogs, torpedoes, and the like.

Meantime by extending to dielectric bodies the formulæ that Poisson, Ampère, and Neumann had established for magnets and conductive bodies, James ClerkMaxwell (183179) was enabled to create a new branch of electrodynamics, and thereby bring to light the longsought link connecting the sciences of electricity and optics.

Ampère's memoir gave the initial impetus to researches which have greatly broadened the field of electrodynamics and electromagnetism.

The mathematical expression for electrodynamic action led, in the mind of Gauss, to the conviction that a theory of the propagation of electric action would in time be found to be the very keystone of electrodynamics.

Navigation is not the final cause of astronomy, nor telegraphy of electrodynamics, nor dyeworks of chemistry.

Ampère first received the news of Oersted's experiment on September 11, 1820, and on the 18th of the same month he announced to the Academy the fundamental principles of the science of electrodynamics  seven days of rapid progress perhaps unequalled in the history of science.
A History of Science: in Five Volumes. Volume III: Modern development of the physical sciences
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