Definition of libertarian:
(n) :
one who advocates liberty either generally or on a specific issue, e.g. "civil libertarian" (in favour of civil liberties); (Chiefly US) A believer in a political doctrine that emphasises individual liberty and a lack of governmental regulation and oversight both in matters of the economy ('free market') and in personal behavior where no one's rights are being violated or threatened. Also 'classical liberal', akin to '
anarcho-capitalist'
(adj) :
relating to the beliefs of libertarians, as in, "He has libertarian views". A relative tendency towards liberty, as in "libertarian socialist"