Repeats in a Design of Experiments methodology is a trial that is conducted; then, each trial is immediately repeated before moving onto the next trial condition. This methodology is useful in learning about experimental error. Contrast this with replicating. With replicating, all of the trials are conducted; then only after all have been completed, they all are conducted again. This also is useful in learning about experimental error, but replication is better because it spreads out the element of time across the whole set of experimental trials.
