interdepartmental

adjective
in·ter·de·part·men·tal | \ ˌin-tər-di-ˌpärt-ˈmen-tᵊl , -ˌdē- \

Definition of interdepartmental 

: existing, exchanged, or carried on between two or more departments (as of an organization) or their members an interdepartmental committee especially : characterized by participation or cooperation of two or more departments of an educational institution an interdepartmental course of study

Other words from interdepartmental

interdepartmentally \ˌin-tər-di-ˌpärt-ˈmen-tə-lē, -ˌdē- \ or less commonly inter-departmentally adverb
working interdepartmentally

First Known Use of interdepartmental

1855, in the meaning defined above

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The first known use of interdepartmental was in 1855

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