Definition of "Structural" :

adjective: concerned with systematic structure in a particular field of study

adjective: affecting or involved in structure or construction

"The structural details of a house such as beams and joists and rafters; not ornamental elements."

adjective: relating to or having or characterized by structure

"Structural engineer."

adjective: relating to or caused by structure, especially political or economic structure

"Structural unemployment in a technological society."

adjective: relating to or concerned with the morphology of plants and animals

adjective: pertaining to geological structure

"Structural effects of folding and faulting of the earth's surface."