Piecemeal Litigation refers to a circumstance in which more than one court is seized of the adjudication of the same issue.
The following is an example of a caselaw defining piecemeal litigation:
Piecemeal litigation occurs when different courts adjudicate the identical issue, thereby duplicating judicial effort and potentially rendering conflicting results. [Weber v. Van Fossen, 496 F. Supp. 2d 826 ( E.D. Mich. 2007)]