(~s)
1.
In the past, a ~ was a strong building in or near a city, where people could shelter for safety.
The ~ at Besancon towered above the river.
= fortress
N-COUNT
2.
If you describe a system or organization as a ~ of a particular way of life, usually one you disapprove of, you mean that it is powerful and effective in defending that way of life. (FORMAL)
The business is no longer regarded as a ~ of commerce.
= bastion, stronghold
N-COUNT: usu N of n disapproval