Computer
A computer is a device that can be instructed to carry out sequences of arithmetic or logical operations automatically via computer programming. Modern computers have the ability to follow generalized sets of operations, called programs. These programs enable computers to perform an extremely wide range of tasks.
Security
Security is freedom from, or resilience against, potential harm (or other unwanted coercive change) from external forces. Beneficiaries (technically referents) of security may be persons and social groups, objects and institutions, ecosystems, and any other entity or phenomenon vulnerable to unwanted change by its environment.
System
A system is a regularly interacting or interdependent group of items forming an integrated whole. Every system is delineated by its spatial and temporal boundaries, surrounded and influenced by its environment, described by its structure and purpose and expressed in its functioning.
System
A system is defined as any combination of matter that we wish to study
Earl Bowman Millard (1946). Physical chemistry for colleges: a course of instruction. p. 30.
System
Everyone knows what engineering is. All that's left is to define systems, and I'm not fool enough to do that.
Robert Machol (1971) in: Paul Lewis "Mathmaticians Are Useful." The California Tech. May 6, 1971. p. 1: Machol explains his definition of systems engineering.
Security
There is no security on this earth; there is only opportunity.
Attributed to Douglas MacArthur; reported in James B. Simpson, Contemporary Quotations (1964), p. 316; reported as unverified in Respectfully Quoted: A Dictionary of Quotations (1989).
