in ‧ ter ‧ de ‧ pen ‧ dence /ˌɪntədɪˈpendəns $ -tər-/ BrE AmE ( also in‧ter‧de‧pen‧den‧cy /-dənsi/) noun [countable usually singular, uncountable]
a situation in which people or things depend on each other
interdependence of
the interdependence of our body’s immune and nervous systems