segregation
Concise Oxford English Dictionary © 2008 Oxford University Press:
segregation/seɡrɪˈɡeɪʃn/
▶noun the action of segregating or the state of being segregated.
– derivatives
segregational adjective,
segregationist adjective & noun.
segregational adjective,
segregationist adjective & noun.
'segregation' also found in these Oxford entries:

