interdepartmental
1. [ adjective ] between or among departments
Examples:

"interdepartmental competition"

Related terms: intradepartmental department
2. [ adverb ] between departments
Examples:

"this memo was circulated interdepartmentally"

Similar spelling:   Interior_Department
  intradepartmental
  interdependent
  interdenominational
  interpretative
  interpretation
  interdependency
  interdependence