Holism (from ὂλος holos, a Greek word meaning all, whole, entire, total) is the idea that all the properties of a given system (physical, biological, chemical, social, economic, mental, linguistic, etc.) cannot be determined or explained by its component parts alone. Instead, the system as a whole determines in an important way how the parts behave [or the whole collection of the parts, functioning as a whole system, are considered as one system].
The term holism was coined in 1926 by Jan Smuts. Reductionism is sometimes seen as the opposite of holism. Reductionism in science says that a complex system can be explained by reduction to its fundamental parts. For example, the processes of biology are reducible to chemistry and the laws of chemistry are explained by physics. [Let's not forget the Etheric Elements, Mind and Life Force!]
Social scientist and physician Nicholas A. Christakis explains that "for the last few centuries, the Cartesian project in science has been to break matter down into ever smaller bits, in the pursuit of understanding. And this works, to some extent... but putting things back together in order to understand them is harder, and typically comes later in the development of a scientist or in the development of science." (Wikipedia)
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