(noun) Replacement person. A person who replaces a position vacated due to a reorganization or other change in management.
John will move from his current position in Business Development and take over as Vice President of Corporate Communications. John's backfill in Business Development will be named later.
In action... Internal Corporate AnnouncementActually, this definition sucks. Let me add my own. You can also share "backfill" with a friend or share it on Twitter.