Structure as defined by the dictionary is either:
1. (Noun) An arrangement of and relations of parts/elements of a something complex
2. (Noun) A building or other object constructed from several parts
3. (Verb) construct or arrange according to a plan; give a pattern or organisation to
However, I believe the definition supplied fails to cover everything. In my opinion many things can be described as structured or a structure; much more than the dictionary would allow. In my opinion, everything is a structure whether it be directly or indirectly.