What is the meaning of Libertarian?

One who advocates liberty, either generally or in relation to a specific issue.

A believer in right-libertarianism, a political doctrine that emphasizes individual liberty and a lack of governmental regulation, intervention, and oversight both in matters of the economy (‘free market’) and in personal behavior where no one’s rights are being violated or threatened.

A left-libertarian, an antiauthoritarian believer in both individual freedom and social justice (social equality and mutual aid).

A believer in the freedom of thinking beings to choose their own destiny, i.e. a believer in free will as opposed to those who believe the future is predetermined.

Having the beliefs of libertarians; having a relative tendency towards liberty.

Relating to liberty, or to the doctrine of free will, as opposed to the doctrine of necessity.

Source: wiktionary.org