The belief that women are and should be treated as potential intellectual equals and social equals to men. These people can be either male or female human beings, although the ideology is commonly (and perhaps falsely) associated mainly with women.
The basic idea of Feminism revolves around the principle that just because human bodies are designed to perform certain procreative functions, biological elements need not dictate intellectual and social functions, capabilities, and rights.
Feminism also, by its nature, embraces the belief that all people are entitled to freedom and liberty within reason—including equal civil rights—and that discrimination should not be made based on gender, sexual orientation, skin color, ethnicity, religion, culture, or lifestyle.
Feminists—and all persons interested in civil equality and intellectuality—are dedicated to fighting the ignorance that says people are controlled by and limited to their biology.
Feminism is the belief that all people are entitled to the same civil rights and liberties and can be intellectual equals regardless of gender. However, you should still hold the door for a feminist; this is known as respect or politeness and need have nothing whatever to do with gender discrimination.