What is the meaning of the word "side"?

Definitions:

a family line of descent noun
- They get their brains from their father's side.
a line segment forming part of the perimeter of a plane figure noun
- the hypotenuse of a right triangle is always the longest side
a place within a region identified relative to a center or reference location noun
- they always sat on the right side of the church
a surface forming part of the outside of an object noun
- The jeweler examined all sides of the crystal.
an aspect of something, as contrasted with some other implied aspect noun
- They were on the heavy side.
an extended outer surface of an object noun
- I turned the box over to examine the bottom side.
an opinion that is held in opposition to another in an argument or dispute noun
- there are two sides to every question
either the left or right half of a body noun
- After running a few blocks, I had a pain in my side.
one of two or more contesting groups noun
- the Confederate side was prepared to attack