The action of the verb CENTRALIZE. Also attrib.

1

1845.  J. H. Newman, Ess. Developm., 171. The centralising process by which the See of St. Peter became the Head of Christendom.

2

1883.  J. Sime, Hist. All-Israel, 544. They would have been displaced by the centralizing shadowed out in these new arrangements.

3