HOLISM
holism, holistic theory
(noun) the theory that the parts of any whole cannot exist and cannot be understood except in their relation to the whole; “holism holds that the whole is greater than the sum of its parts”; “holistic theory has been applied to ecology and language and mental states”
Source: WordNet® 3.1
Etymology
Noun
holism (countable and uncountable, plural holisms)
A theory or belief that the whole is greater than the sum of the parts. [from 1926]
A practice based on such a theory or belief.
Source: Wiktionary