D defs.my
Entry 2 senses Webster, 1913

Collaboration

/kəl-ăbˌ-ẽr-āsh'-ən/ · Col·lab·o·ra·tion · IPA /kəˌlæbəˈɹeɪʃən/
01 n. The act of working together; united labor.
  1. 1.
    The act of working together; united labor.
  2. 2.
    the act of willingly cooperating with an enemy, especially an enemy nation occupying one's own country.