If used in a non-political sense, "liberal" simply means "a lot."

Large, beautiful breasts that are keep well consealed and initially appear to be much smaller and less impressive than they actually are until unleashed.

someone who is usually subjected to narrowminded hostility in his or her own time, but is vindicated by posterity. Many of the political figures we revere today were liberals in their own time.

A so-called "bad" thing to be before, now and probably in the future. It's been somehow turned into an attack word. What people don't realize is that no kind of progress is made without even an ounce of liberalism in your blood. Civil rights movement? Liberal from MLK Jr. Free speech/checks and balances/etc.? Liberal idea from Enlightenment thinkers. Any kind of new technology? Liberal in the sense that you want to change the existing conditions. Face it. Any kind of change, whether good or bad, is promoted by liberalism.

Technically means those people who embrace all elements of society.

However it is more commonly used as a term for any left-winger.

1. A political ideology responsible for virtually all social progress in history; see creation of democracy.

Liberalism is really the politics of the thinking man. Areas of the country with the highest percentages of educated people, for example, are overwhelmingly liberal. Stereotypically, liberals know too much for their own good. Oftentimes while conservatives are busy making horrible political decisions, liberals alone bear the burden of actually having to understand what consequences will arise. See also, Democrat, which is a happy middle ground politically speaking for liberals who have too much money to be totally idealistic, or for marginalized groups who have traditionally been alienated by the antics of many in the Republican party.