It means set of individuals or people, population, grouping. It usually refers to a group of people who are part of a study, most often epidemiological in nature, but that may well be for other kinds of research.
tactical cohorte:Unidad of infantry in the ancient Roman army, created by the Emperor augusto. 2 cohort is a set, a number, or a series.
A group of individuals of a population who have lived through an experience or have a set of common criteria and as part of an epidemiological observation. Cohort studies are initiated with the identification of individuals with and without the factor that is going to investigate ( 41 risk factor; then keeps track of individuals and estimated how distributed the disease between those who possess and do not have this feature. Cohort studies can be prospective * or retrospective *
A group of students who start together in a cycle educational or academic period. Is it now usually used to designate the Group of students who start their cycle of master degree or PhD in any academic discipline.