A test under controlled conditions that is made to demonstrate a known truth, examine the validity of a hypothesis, or determine the efficacy of something previously untried. The process of conducting such a test; experimentation. An innovative act or procedure:"Democracy is only an experiment in government"(William Ralph Inge). The result of experimentation:"We are not [nature's] only experiment"(R. Buckminster Fuller). To conduct an experiment. To try something new, especially in order to gain experience: experiment with new methods of teaching.