NOTE 1 In addition to terms used in the three official ISO languages (English, French and Russian), this document gives the equivalent terms in Spanish, Arabic, German, Finnish, Italian, Dutch, Norwegian, Portuguese and Swedish. The terms in Spanish are published under the responsibility of the ISO/TC 207 Spanish Translation Task Force (STTF); the terms in Arabic are published under the responsibility of the ISO/TC 207 Arabic Translation Task Force (ATTF); the other terms are published under the responsibility of the member bodies for Germany (DIN), Finland (SFS), Italy (UNI), Netherlands (NEN), Norway (SN), Portugal (IPQ) and Sweden (SIS). The equivalent terms are given for information only. Only the terms and definitions given in the official languages can be considered as ISO terms and definitions.

NOTE 2 The notes appended to certain definitions offer clarification or examples to facilitate understanding of the concepts described. In certain cases, the notes may differ in different languages for linguistic reasons, or additional notes may be given.

NOTE 3 The terms and definitions are laid out in a systematic order, with an alphabetical index. A term in a definition or note that is defined in another entry is indicated by bold-face followed by its entry number in parentheses. Such terms may be replaced by their complete definition.