From Longman Business Dictionary
expositionex·po·si·tion /ˌekspəˈzɪʃən/ noun [countableC] formal1MARKETING a large international show that is open to the public, where new products, especially industrial products, can be seenSYN EXHIBITIONthe Enterprise Computing Exposition
2a detailed explanation of a particular idea or THEORYGreat care must be taken to make the exposition clear to a non-technical audience.