A definition of libertarianism?

Read it here. Written by David Boaz for Encyclopedia Britannica.

Fair warning: some libertarians will become apoplectic over the clause "God-given individual rights."

Here is mine:

An ethical system that recognizes one man as sovereign from the next. Thus libertarians advocate capitalism, diplomacy, and limited government by representative republic.

Libertarians in turn define capitalism as a network of voluntary exchanges and strict private property rights; formal in that civil rights are specific and inviolable, informal in that central planning is not only considered inefficient, but morally errant.