Ex·per·i·ment v. t. [imp. & p. p. Experimented; p. pr. & vb. n. Experinenting.] To make experiment; to operate by test or trial; -- often with on, upon, or in, referring to the subject of an experiment; with, referring to the instrument; and by, referring to the means; as, to experiment upon electricity; he experimented in plowing with ponies, or by steam power.