Etymology
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physics (n.)

1580s, "natural science, the science of the principles operative in organic nature," from physic in sense of "natural science." Also see -ics. Based on Latin physica (neuter plural), from Greek ta physika, literally "the natural things," title of Aristotle's treatise on nature. The current restricted sense of "science treating of properties of matter and energy" is from 1715.

Before the rise of modern science, physics was usually defined as the science of that which is movable, or the science of natural bodies. It was commonly made to include all natural science. At present, vital phenomena are not considered objects of physics, which is divided into general and applied physics. [Century Dictionary, 1895]

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Definitions of physics

physics (n.)
the science of matter and energy and their interactions;
his favorite subject was physics
Synonyms: natural philosophy
physics (n.)
the physical properties, phenomena, and laws of something;
he studied the physics of radiation
Synonyms: physical science
From wordnet.princeton.edu