Answer: synchronising

AnswerCrossword Clue
synchronisingTally; agree
synchronisingCoordinate; combine
synchronisingSYNCHRONISE, to cause to happen at the same time
synchronisingOccur at the same time or rate
synchronisingAdjust (a clock or watch) to show the same time as another
synchronisingCause to occur or operate at the same time or rate