1. The quality or state of not being additive; the property of a system or function where the whole is not equal to the sum of its parts.
Usage: technical; used in mathematics, physics, chemistry, and systems theory; plural form of nonadditivity

Examples

• The nonadditivities in the chemical reaction made it impossible to predict the final product by simply adding the individual component effects.
• Researchers studied the nonadditivities present in complex biological systems.
• The model failed to account for the nonadditivities between different variables.
• Nonadditivities in gene interactions explain why some traits do not follow simple inheritance patterns.
• The engineer had to adjust the design to compensate for the nonadditivities in the system's behavior.