Enclave (noun)

1. A territory that is entirely surrounded by the territory of one other state.
2. A group of people who share a particular characteristic, living in a place among people who do not share it.
3. A place or group that is distinct within a larger surrounding area.

Origin:

Mid 17th century: from french, from enclaver "surround with a rampart", based on medieval latin inclavare "to lock in, secure", from in- "in" + clavis "key".

Examples:

1. A small enclave of land surrounded by a larger country.
2. An ethnic enclave within a city.
3. The Jewish enclave in the city.
4. A wealthy enclave of homes.
5. The company was an enclave of innovation.