1830, from interdependent + abstract noun suffix -cy.
Entries linking to interdependency
interdependent adj.
1817 (Coleridge), from inter- + dependent. Related: Interdependently.
-cy
abstract noun suffix of quality or rank, from Latin -cia, -tia, from Greek -kia, -tia, from abstract ending -ia (see -ia) + stem ending -c- or -t-. The native correspondents are -ship, -hood.