I think this pretty much sums it up:
Liberal
1. a. Not limited to or by established, traditional, orthodox, or authoritarian attitudes, views, or dogmas; free from bigotry.
b. Favoring proposals for reform, open to new ideas for progress, and tolerant of the ideas and behavior of others; broad-minded.
c. Of, relating to, or characteristic of liberalism.
d. Liberal Of, designating, or characteristic of a political party founded on or associated with principles of social and political liberalism, especially in Great Britain, Canada, and the United States.