|Abortion has etymologically, in a wide sense, two nuclear denotations: 1) disruption or arrest of the progress of a process, in this case non-arrived-to-birth or born (or delivery) before (normal) birth; 2) the obliteration of a process, in this case, the death of the fetus or embryo or the act of killing it. Any disruption of growth (with or without delivery, with or without fetal death) since beginning to birth is included in this wide meaning; also, it includes the killing of the embryo or the fetus.
The impact factor of journal provides quantitative assessment tool for grading, evaluating, sorting and comparing journals of similar kind. It reflects the average number of citations to recent articles published in science and social science journals in a particular year or period, and is frequently used as a proxy for the relative importance of a journal within its field. It is first devised by Eugene Garfield, the founder of the Institute for Scientific Information. The impact factor of a journal is evaluated by dividing the number of current year citations to the source items published in that journal during the previous two years.