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As a noun, a part is a section of a greater whole. It is normally an intentional segment rather than one caused by disection. See e.g. Standard Industrial Classification for various categories.
As a verb, to part means to divide or separate.
In music
In music a part is the line of music played by an individual instrument (or group of identical instruments) within a larger work. It also refers to the printed copy of the music for each instrument, as distinct from the score which holds the music for all instruments. For example in a string ensemble you would have separate parts for Violin 1, Violin 2, Viola and Cello, even though there might be several of each instrument (and therefore several copies of each part). See: Voice, ensemble, polyphony, counterpoint.
In mereologic geometry
Any geometric object such as a point, line, arc, circle, polygon, polyhedron, or polytope that can be joined together to form a whole.
May also be defined as a bounded region in the plane for two dimensional geometry and a bounded region in space for three dimensional geometry.
There are two kinds of parts complex and simple. Complex parts can be dissected into simple parts and simple parts can not be dissected further.
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