The cohort effect describes a group of people forming a bond due to having common life experiences. An example of the cohort effect is a group of employees at a specific company who work closely together.
Cohorts are people who have similar characteristics and have started the job at around the same time. A cohort may also describe a group of people going through something difficult, such as cancer treatment. If a group of people, for example, have their chemotherapy sessions at the same time each week and start at about the same time, they may bond from going through the treatment together.