What Is It Called When Scientists Do Their Experiment More Than Once?

When a scientist repeats an experiment more than once, it is called replication. The goal is to create an experiment that can be repeated multiple times and yield the same or similar results, regardless of whether it is the same scientist performing the experiment.

Replication abides by the goals of science, which are to reconstruct and prove the laws of nature in order to understand and explain them to the rest of the world. If what an experiment proves is supposed to be a law, then future experiments designed along similar constructs should also show the same or similar results to correlate with the proven law or theory.