Numerical control, a technique for automatically controlling equipment, is a system in which machine actions are determined by symbolic data recorded on a suitable media. This glossary of standardized nomenclature for numerical control defines and describes some 286 technical words and terms. Numerous entries are defined and described as they apply to numerical control. It is for those who are conversant with numerically controlled equipment or for those who seek to understand this technology. A selected bibliography is included. (DAG)