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Physics n. From the Greek, φύσις (phúsis), "nature" and φυσικῆ (phusiké), "knowledge of nature". The science concerned with the discovery and understanding of the fundamental laws which govern matter, energy, space and time.1
The science of nature, or of natural objects; that branch of science which treats of the laws and properties of matter, and the forces acting upon it; especially, that department of natural science which treats of the causes (as gravitation, heat, light, magnetism, electricity, etc.) that modify the general properties of bodies; natural philosophy.2
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