The concepts that are semantically unrelated. Same terms are used for different concepts.

Goh, Cheng Hian. Representing and reasoning about semantic conflicts in heterogeneous information systems. Diss. Massachusetts Institute of Technology, 1996. [http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.139.5885&rep=rep1&type=pdf]