The area of the Solar System that comprises certain objects that are relatively close to the Sun, including Mercury, Venus, Earth and Mars, while not including the other planets.

(computing) A set of data types that are common to all .NET languages and can be shared over CLI.

(transport, space science) A Shuttle-derived heavy launch vehicle being designed by NASA to replace the Space Shuttle.

(immunology) The initial line of defense that entails a cascade of cells and mechanisms that protect the host from infection by different organisms in an indeterminate pattern.

(immunology) A system, activated by the innate immune system, that consists of particularly specialized systemic cells and processes that remove or counter pathogenic growth.

(endocrinology) A collection of hormones involved in the regulation of the body's blood pressure and water content

(programming) A major type system where compatibility and equivalence of data types are determined by explicit declarations or the names of the types.

(software) Synonym of nominative type system

(pathology) A systemic autoimmune disease (or autoimmune connective tissue disease), where the immune system attacks the body's cells and tissue and causes inflammation and tissue damage.

(travel, aviation) a multi-access reservation system used by the travel industry and airlines.