Technical Abstract: In 1991, Terminology for Grazing Lands and Grazing Animals was published with the objective of ‘developing a consensus of clear definitions of terms used in the grazing of animals.’ During the XVIII International Grassland Congress, held in Canada in 1997, a new Terminology working group was formed to begin discussions regarding the first revision of this publication. As was the objective from the beginning, this first revision was to be international in scope and a focused effort was made to include broad international representation and expertise. As with the first edition of Terminology, our objective has been to develop a consensus of terms and definitions to ensure clear international communication regarding grazing lands and grazing animals. Terms included here have relevance to both domesticated and wild grazing animals. It is intended that these terms enhance communication in education, science, industry, and production and that they become the standard for use in publications. It has been our goal to include terms that are relevant specifically to grazing lands and grazing animals and to present these, where appropriate, in a hierarchy that shows the relationships among such terms. We have attempted to agree on a single, concise definition for each term and to avoid multiple definitions. Because of international variations in a few terms, we have included a list of the various international interpretations in an Appendix but have recommended the use of a specific term and definition. It is hoped that this will take us toward a more uniform international language. Finally, as we reviewed terms and definitions, there were some that did not appear to contribute to clear communication. We have listed these in an Appendix and provided an explanation for our recommendation that they not be used.