the deliberate destruction of an ethnic group or nation by means of nominally peaceful demographic replacement of a significant proportion of that ethnic group or nation's population.

Examples

1) Advocates for open borders and those who espouse hatred for European-Americans are openly working towards replaciding European-Americans.

2) The people of the Corded Ware Culture (c. 3000-2350 BCE) largely replacided the native neolithic farming populations of Central Europe over the course of many hundreds of years.

(http://www.autoadmit.com/thread.php?thread_id=4028391&forum_id=2#36444988)