In Latin cursus is "current, flow, stroke", from where several interpretations derive in Spanish. 1o_ Any process that has a recognizable start, development and end, such as a career of study or competence, or an illness, or a walk, a walk. 2o_ In the case of groups (classes, runners) is also the number of people who participate or follow the course. 3o_ Movement of water in a river, from birth to mouth. 4o_ By exaggerated association with the river, a diarrhoea .