(a) General. — When used in this article, or in the administration of this article, terms defined in this section shall have the meanings ascribed to them herein unless a different meaning is clearly required by either the context in which the term is used, or by specific definition in this article.
(b) Terms defined. —
(1) Business income. — The term "business income" means income arising from transactions and activity in the regular course of the taxpayer's trade or business and includes income from tangible and intangible property if the acquisition, management and disposition of the property or the rendering of services in connection therewith constitute integral parts of the taxpayer's regular trade or business operations.