This dictionary explains 225 terms used in bibliometrics, and it provides nontechnical definitions of bibliometric concepts and suggests sources where more information can be found about the defined term. Special features include sample references, cross references, variants (synonyms), and an index of names. The introduction relates the terms of bibliometrics, informetrics, and scientometrics; describes the areas of scholarly communication and evaluation of information services; and explains mathematical terminology and symbols. (AEF)