A process of experimenting with different possibilities in an effort to determine which option works best or produces the desired outcome. For example, a company might try several options for packaging a new product in order to determine which option produces the most sales. Those options that do not produce satisfactory results—the errors—are rejected.
An attempt to accomplish something by trying various means until the correct one is found. for example, The only way to solve this problem is by trial and error. The error here alludes to the failed means or attempts, which are discarded until the right way is found. [c. 1800]