con·flict of interest /'kän-ˌflikt-/
1: a conflict between the private interests and the official or professional responsibilities of a person in a position of trust
2: a conflict between competing duties (as in an attorney's representation of clients with adverse interests) see also aba model rules of professional conduct in the important laws section
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.