This part of ISO 4378 gives the most commonly used terms relating to lubrication of plain bearings with their definitions and classification. For some terms and word-combinations, their short forms are given, which can be used when they are unambiguous. Self-explanatory terms are given without definitions. NOTE In addition to terms used in English and French, two of the three official ISO languages, this document gives the equivalent terms in German; these are published under the responsibility of the member body for Germany (DIN), and are given for information only. Only the terms and definitions given in the official languages can be considered as ISO terms and definitions.