It's an interdisciplinary field including, but not excluded to psychology, artificial intelligence, philosophy, neuroscience, anthropology, education, and linguistics.

You can see other people's definitions from the web. What can one do with a degree in Cognitive Science? Good question. Here are some resources with answers: https://career.berkeley.edu/Major/CogSci.stm http://www.case.edu/artsci/cogs/careerpossibilities.html