1) a part of the sea or of a large lake, enclosed by a wide curve of the shore (bay)

2) a space enclosed by a curved line, every point on which is at the same distance from the center (circle)

3) a place (in a building or enclosed by buildings) where people come together (concourse)

4) a large area of water enclosed by land (lake)

5) the space enclosed by outer walls or boundaries, e.g. of a cathedral or university (precinct)

6) a part of a house or other building enclosed by walls and a ceiling; a space that is or might be occupied, or that is enough for a purpose (room)