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physical system (Noun) The portion of the physical universe chosen for analysis, with everything outside the system known as the environment. Freebase (2.00 / 2 votes) Rate this definition: Physical system. In physics, the word system has a technical meaning, namely, it is the portion of the physical universe chosen for analysis. Everything outside the system is known as the environment, which in analysis is ignored except for its effects on the system.
Physics is the study of the basic elements of nature dealing with the key components that govern it, energy, matter and the their interaction in time and space. As such physics provides an important anchor to the to study all higher order scientific studies such us Biology and Chemistry. Without space, matter, energy and time the living organisms will not exist, and the ability to create a science that would study living things, Biology, would not exist either.