Here is what I think.
Liberal is the will to look toward the future and see what is best for not only the individual (person, religion, and any special interest group) but for everyone within the society. Being liberal is when you look at the possibilities that could result from change from the status quo and see how you could acheive such a change for the better of society.
Examples of famous liberal events in history in this nation (in no particular order):
(1) Faith (one of our posters) and her kind is given the right to vote.
(2) The Declaration of Independence.
(3) The Emancipation Proclamation. (Note: if you don't know what this is, I'm going to kick your ass!)
(4) Declaration by the Supreme Court of the unconstitutionality of Sodomy Laws (2001).
(5) Social Security/Welfare/Financial Aid for students
(6) Roe VS. Wade
(7) The First Amendment