complementarity

toisiaan täydentävyys The state or characteristic of being complementary
1987 April 2, Kenneth N. Gilpin, "http://www.nytimes.com/1987/04/02/business/2-forecasting-firms-to-merge.html 2 Forecasting Firms to Merge," New York Times (retrieved 1 April 2014):

"Synergy is one of the most overused words in the English language, but there is a tremendous complementarity to these organizations."