Emergence
Emergence (from the English emergent — “arising, unexpectedly appearing”) in systems theory is the presence of properties in a system that are not inherent in its components individually; it is the irreducibility of the system’s properties to the sum of the properties of its components.
Related concepts in systems theory and other fields include synergy, holism, system effect, superadditive effect, non-compositionality, and epiphenomenality (English).