One with liberal views, supporting individual liberty (see Wikipedia's article on Liberalism).

Someone left-wing; one with a left-wing ideology.

A supporter of any of several liberal parties.

(now rare outside set phrases) Pertaining to those arts and sciences the study of which is considered to provide general knowledge, as opposed to vocational/occupational, technical or mechanical training.

“1983, David Leslie Wagner, The Seven liberal arts in the Middle Ages”

Generous; willing to give unsparingly.

“He was liberal with his compliments.”

Ample, abundant; generous in quantity.

“Add a liberal sprinkling of salt.”