One who performs experiments.
A person who values the results of experiments over theory.
A person who seeks or enjoys new experiences.
"Experimentalist" is a blanket term for all sorts of scientists engaged more in experimental activity than in the theoretical side of their sciences. The word "experimenter" emphasizes the person running an experiment, usually in a single instance; "experimentalist," by contrast, indicates a pattern in a person's approach to discovering knowledge. "Experimentalist" is also used in reference to a personality type that builds up gradually to a work. Here the term is not limited to science, but is frequently used in relation to artists. Famous "experimentalists" could include Cézanne, Mark Twain or Robert Frost. The opposite of being an Experimentalist is to be a Conceptualist. Colloquially, an Experimentalist has been defined as "one who prefers to ascertain by finding out."