in ‧ ter ‧ de ‧ part ‧ men ‧ tal /ˌɪntəˌdiːpɑːtˈmentl $ ˌɪntərdɪˌpɑːrtˈmentl/ BrE AmE adjective [usually before noun]
between or involving different departments of a company, government etc:
intense interdepartmental rivalry
in ‧ ter ‧ de ‧ part ‧ men ‧ tal /ˌɪntəˌdiːpɑːtˈmentl $ ˌɪntərdɪˌpɑːrtˈmentl/ BrE AmE adjective [usually before noun]
between or involving different departments of a company, government etc:
intense interdepartmental rivalry
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012