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physics

Pronunciation: /ˈfɪzɪks/

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Definition of physics

noun

[treated as singular]

the branch of science concerned with the nature and properties of matter and energy. The subject matter of physics includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms.
the physical properties and phenomena of something:the physics of plasmas

Origin:

late 15th century (denoting natural science in general, especially the Aristotelian system): plural of obsolete physic 'physical (thing'), suggested by Latin physica, Greek phusika 'natural things' from phusis 'nature'