What do you think of this definition of sexism? (Source on my page)?

"Short definition: Sexism is both discrimination based on gender and the attitudes, stereotypes, and the cultural elements that promote this discrimination. Given the historical and continued imbalance of power, where men as a class are privileged over women as a class (see male privilege), an important, but often overlooked, part of the term is that sexism is prejudice plus power. Thus feminists reject the notion that women can be sexist towards men because women lack the institutional power that men have."