job run
A job run is a run of a specific job on its scheduled start date. Jobs that are scheduled to run exactly once will have one job run. Recurring jobs will have one job run per scheduled occurrence. For example, a job that runs every day of the week has a job run on Monday, another job run on Tuesday, another job run on Wednesday, and so on.
OS Command and SQL Script jobs that execute their job logic against multiple targets have job runs that consist of multiple executions, one job execution per target.