What might cause 1 + 1 > 2 (7)

I believe the answer is:

synergy

(Other definitions for synergy that I've seen before include "Mutual cooperation producing greater effect" , "Extra benefit of working together" , "Beneficial interaction" , "Productive cooperation" , "Combined action" .)

I've seen this clue in The New York Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.