1) surrounded by, in the middle of, (more than two) (among)

2) completely surrounded (by something) (engulfed)

3) an area of land, usually surrounded by hedges, fences etc, used for cattle or for growing crops (field)

4) a part of the sea almost surrounded by land (gulf)

5) a piece of land surrounded by water (island)

6) a long piece of land, e.g. Italy, almost surrounded by water (peninsula)

7) a space in the form of a rectangle, (almost) surrounded by buildings (quadrangle)

8) a sudden breaking out by soldiers who are surrounded by the enemy (sally)