What is the meaning of Transcendentalist?

One who believes in transcendentalism.

Any of a group of philosophers who assert that true knowledge is obtained by faculties of the mind that transcend sensory experience; those who exalt intuition above empirical knowledge and ordinary mentation. Used in modern times of some post-Kantian German philosophers, and of the school of Emerson.

transcendentalist

Source: wiktionary.org