the quality or condition of being interdependent, or mutually reliant on each other: Globalization of economies leads to an ever-increasing interdependence of countries.
Sometimes, interdependency.

inter- + dependence

noninterdependence, noninterdependency, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
interdependence (ˌɪntədɪˈpɛndəns)
dependence between two or more people, groups, or things: the interdependence of economies

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1822, from inter- + dependence.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

interdependence definition

In economics, the concept that all prices are to some degree affected by all other prices and also that all markets are affected by all other markets.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Indeed, the relationship among advanced postindustrial countries is one of
  complex interdependence.
Globalization and interdependence are as ubiquitous to education as they are to
  economies and politics.
Once groups start to get larger, altering the tight interdependence necessary
  for survival, patterns of group behavior change.
The concept of functional regions provides a way to examine the linkages and
  flows that create interdependence among people.
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