In computer storage,to replace all binary data with zeros or other "null"codes. Erasing is the equivalent to clearing a storage area.

The study of equipment design in the context of man/machine interface,with the express purpose of reducing operator fatigue and discomfort, and to ensure maximum operating conditions.

Slip of paper inserted into a book and containing list of the author's or printer's errors discovered too late to be corrected..

A computer keyboard key that is used to exit a mode or routine, or cancel some function.

The movement equals to the width of the character just set so that the next character does not overlap. On most type writer, the escapement value of each character is identical. On typesetters,the escapement value of each character is different.

Long-fibred grass,grown in North Africa and Spain, used in pulp for paper-making.

Determining the cost of printing a job before it is undertaken.

(1)In photoengraving,the eating away of the non-printing areas of the printing plate by acid to produce a relief printing surface,or in gravure,the eating away of the image into the copper printing plate by acid.

(2)In offset lithography,the chemical(phosphoric acid plus gum arabic)treatment of the  non-printing areas of the plate so as to increase the water acceptability in the non-image areas.

(3)In art, an intaglio process of making prints from an etched plate. 

Book pages bearing even folio numbers. For books open by the right,these pages are the left-hand pages. Also called Verso.For books open by the left,as in tradition Chinese style which are set vertically, these pages are the right-hand pages.

A list of directions for the hyphenation of words that the hyphenation logic of the computer will be able to break properly. The dictionary may include several thousand words to ensure that line ending decisions are of a sufficient standard

Exchangeable disk storage

Refers to disc pack storage used with mainframe computers.

Type area exclusive of headline and folio See inclusive type area.

To perform a computer instruction or run a program.

A component added to a computer system in order to enhance its capabilities.Expansion boards,also known as add-on board, may provide the user with additional memory,graphics, colour, communications features,etc.

Any socket on the out side of a computer through which an additional processor,extra memory or a peripheral can be connected.

A computer package that will enable the user to gain accss to the knowledge and reasoning of experts.Examples of expert systems are medical diagnosis, investment analysis,production control and training, etc.

The process in which light sensitive materials, such as film or plates, are exposed to a light source.

An instrument which measures light intensity and provides information for proper exposure.Calibrated for different emulsion speeds.

Extended type

See expanded type,

A white pigment used with a coloured pigment either to reduce its strength or improve its working qualities.

Peripheral storage that is outside of the CPU,such as disk and tape.

Quoted matter within a text, often set indented and in a smaller type size.

Small metal flanged ring clenched into a punched hole for reinforcement to prevent tearing.