Altmetrics: Altmetrics go beyond normal citation metrics to include alternative impact measures including downloads, views, blogs and tweets. Altmetrics expand the community of comment beyond the limits of bibliometrics.
Article Influence:The Eigenfactor score divided by the number of articles published in journal. "I know how impactful the journal as a whole is, but what about the average individual article in the journal?"
Article Level Metrics: Impact measures at the article level, e.g. number of citations to a specific article.
Author Identities: Codes that identify the works of an author as distinct from an author with the same or similar name.
Author Impact Factor:The impact of a specific author based on the number of citations over time. h-index is an example of an author impact factor.
Bibliometrics: in the context of impact factor, measures of citations at the journal and article level.
Cited Half-Life: "The cited half-life is the number of publication years from the current year which account for 50% of current citations received." (Ladwig and Sommense)
Eigenfactor Score: the number of times articles from a journal published in the past five years have been cited in the JCR year; this measure also considers which journals have contributed these citations so that highly cited journals will be more influential than lesser cited journals.
g-index: The g-index is the "highest number of papers of a scientist that received gg2 or more citations" (Schreiber). It was proposed by Egghe in 2006 to overcome a bias against highly cited papers inherent in the h-index.
Author Metrics: Google provides its own calculations for an author's h index, including a number of variations based on it's indexed content.
Journal Metrics: Lists top publications based on their "five-year h-index and h-median metrics."
h-Index: Proposed by J.E. Hirsch in 2005 the h-index is intended to serve as a proxy of the contribution of an individual researcher. The h index is calculated through a formula that considers the number of publications and the number of citations per publication.
i10-index: Introduced by Google Scholar in 2011 the i10-index measures an authors publications with at least 10 citations.
Immediacy Index: The average number of times a journal article is cited in its first year. Used to compare journals publishing in emerging fields.
Impact Factor: a measure of often a journal or specific author is cited. The intent is to assign a number as a proxy for the contribution of a publication or researcher to the field.
ORCiD: Open Researcher and Contributor ID, a researcher identification system not tied to a specific vendor. The ORCID is intended to disambiguate author/researcher names across publishers and across all areas of contribution.
Research Impact: "Research impact is the demonstrable contribution that excellent research makes to society and the economy. Impact embraces all the extremely diverse ways in which research-related knowledge and skills benefit individuals, organizations and nations including academic, economic, and societal impacts...” (UKRI)
ResearcherID: the author identification system supported by Thomson Reuters.
Self-Citation: referencing one's own publications. There is nothing wrong with citing one's own research but is not considered as meaningful as citations by others.
Many of these definitions are used with the kind permission of Robin Sinn and John Hopkins University
or from the University of Michigan and from Hesburgh Libraries.