structure

A structure is the way that something is put together. It is the arrangement of the parts of something. For example, the structure of a house is the way that the walls, roof, and windows are put together. The structure of a molecule is the way that the atoms are arranged.

Structures can be simple or complex. A simple structure might be a pile of blocks. A complex structure might be a machine or a living organism.

Structures are important because they help things to work. The structure of a house keeps it from falling down. The structure of a molecule determines its properties.

The building has a complex structure.