ɪkˈspɛ.ɹɪ.mənt ɪkˈspɛɹ.ə.mənt ɪkˈspɛ.ɹɪ.mənt ɪkˈspɛɹ.ə.mənt the act of conducting a controlled test or investigation a venture at something new or different as an experiment he decided to grow a beard to conduct a test or investigation We are experimenting with the new drug in order to fight this disease try something new, as in order to gain experience Students experiment sexually The composer experimented with a new style the testing of an idea it was an experiment in living not all experimentation is done in laboratories