central processing unit. The part of a computer that controls all the other parts. It fetches instructions from memory and decodes them. This may cause it to transfer data to or from memory or to activate peripherals to perform input or output.

The three types of routing tables are fixed, dynamic, and fixed central. The fixed table must be manually modified every time there is a change. A dynamic table changes its information based on network traffic, reducing the amount of manual maintenance. A fixed central table lets a manager modify only one table, which is then read by other devices. The fixed central table reduces the need to update each machine's table, as with the fixed table.

central office. Local telephone company office to which all local loops in a given area connect and in which circuit switching of subscriber lines occurs.

It is a triple opening. The central part is arched, while the two lateral sections have a straight upper frame. The term is derived from the name of an architect from Bologna, Sebastiano Serlio (1475-1555), who proposed the design in his manual of architecture, but it was already known in Roman times.

It is a semi-circular or polygonal projection of a building, with a half dome or conch (bowl-shaped vault). In churches it is at the end of the central nave (sometimes also at the end of the side naves or transept) and houses the main altar and the choir. Two identical, facing apses are known as a double apse and where, as in some Romanesque churches, there are three, a triple apse.

(This is an alternative and elegant formulation of the central feedback question.)