1. Relating to or forming part of the structure of a building or other item: "The tornado structurally left several houses with major damage."
2. Referring to the arrangement of and relations between the parts or elements of a complex whole: "Several changes in the business were structurally required if it had any chance of surviving."
3. Used in or necessary to a building; such as, structural beams: "The structurally stronger beams were an important part of the renovation of the old building."