a framework for code execution on OS X
a native implementation of the OS environment running on top of a Unix (or Unix-like) kernel
A subset of an application development kit (ADK) that contains the executable files and other supporting files that comprise the operational environment of the platform.
environment that provides runtime services that may be used by components in an assembly, provides an implementation for one or more connectors, and enforces assembly constraints
The execution environment provided by the Process Manager and other system software services. The runtime environment dictates how executable code is loaded into memory, where data is stored, and how routines call other routines and system software routines See also: runtime architecture