A cohort is a group of persons who experience a certain event in a specified period of time. For example, the birth cohort of 1985 would be the people born in that year.

example of use

Teachers and lecturers in secondary schools, training institutions and universities are as vulnerable to HIV/AIDS as their colleagues in primary schools. Indeed, the current cohorts may be even more vulnerable, since, like their primary-school counterparts, they reached their current professional status in the 1980s and early 1990s, but unlike them rose to even higher educational levels, a factor which at that time was associated with considerably higher risk of infection (Kelly, 2000: 65).

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