(~s)
If a system or organization is described as a ~ of a particular way of life, it is seen as being important and effective in defending that way of life. Bastion can be used both when you think that this way of life should be ended and when you think it should be defended. (FORMAL)
...a town which had been a ~ of white prejudice...
The army is still one of the last male ~s.
= stronghold
N-COUNT: with supp, usu N of n