1 round

2 lump

3 ball

4 to roll into a ball

5 to gather

6 regiment

7 group

8 society

9 classifier for a lump or a soft mass: wad (of paper), ball (of wool), cloud (of smoke)

1 to have a reunion

1 to unite

2 unity

3 solidarity

4 united

1 to reunite

2 to have a reunion

1 group buying

2 collective buying

3 buying by a group of individuals who negotiate a discount for the group

1 to keep on the right side of everyone (idiom)

2 warm and affable

1 brightly colored decorations (idiom)

2 splendid