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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.
The primary Webster's Dictionary definition of the word physics states that it is the science that deals with matter, force, motion and energy. The secondary definition refers to defining the physical properties, processes, composition or phenomena of a system or thing.ccording to Encyclopedia Britannica the word physics describes the science that deals with the structure of matter as well as the interactions between the different parts of the universe. The encyclopedic definition also mentions that physics is the most basic physical science.