interdepartmentalin‧ter‧de‧part‧men‧tal /ˌɪntəˌdiːpɑːtˈmentl $ ˌɪntərdɪˌpɑːrtˈmentl/ adjective [usually before noun] 
between or involving different departments of a company, government etc: 
intense interdepartmental rivalry
between or involving different departments of a company, government etc: intense interdepartmental rivalry