What is the best definition for the word synergy?

The term "synergy" refers to the interaction or cooperation of two or more agents, substances, or companies to produce a combined effect that is greater than the sum of their individual effects. This concept emphasizes working together harmoniously to achieve a more effective outcome. When individuals or entities collaborate, their combined efforts can lead to innovative results that they might not achieve independently, thus the notion of harmony fittingly captures the essence of synergy.

In contrast, the other choices offer meanings that do not align with this definition. Delay suggests a postponement, which is contrary to the proactive nature of synergy. Distress refers to a state of anxiety or suffering, which is oppositional to the positive collaboration implied by synergy. Hindrance indicates an obstruction or barrier to progress, which also runs counter to the idea of cooperative enhancement that synergy embodies.