Русско-англо-русский юридический словарь

A merger of sentences is where an offender who is serving a custodial sentence receives another custodial sentence, the old and new sentences are combined and become one sentence. (Public Safety, Government of Canada)

Merger of sentences occurs when a defendant is convicted of two crimes that are indistinguishable from each other, for which he should only serve concurrent sentences. (Wyoming Law Review)