The meaning of structural is something that is ordered in a precise way or that is strong enough to be used in building. A Lego construction set is an example of a structural toy. Structure possessing, being related with, or being distinguished by structure: a book described as having good structure; structural problems in accounting for animal behavior. Structural comes from the Latin structura which means "a building block". In mathematics, physics and engineering, structure refers to any set of rules or principles that can be applied to create or analyze real-world or hypothetical structures. In architecture and civil engineering, structure describes the framework of a building or other physical object, including its walls, beams, columns, and roof. It also refers to the method by which these elements are joined together to form this framework. The term is used in psychology and sociology to describe the framework within which people understand the world, make judgments about it, and act upon those judgments. It is also used in biology to describe the fundamental organizational patterns found in living things. Finally, structure has come to mean the overall design of anything from a vehicle to a computer program to a musical composition. These are just some of the many ways in which the word structure appears in modern language. Remember, structure means the underlying framework of something.