What really is a structure?

STRUCTURE

1. Something made up of a number of parts that are held or put together in a particular way: hierarchical social structure.

2. The way in which parts are arranged or put together to form a whole; makeup: triangular in structure.

3. The interrelation or arrangement of parts in a complex entity: political structure; plot structure.

4. Something constructed, such as a building.

5. Biology

a. The arrangement or formation of the tissues, organs, or other parts of an organism.

b. An organ or other part of an organism.