Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Language: Latin
Origin: cohors 'enclosed place, people in an enclosure, unit of soldiers in the ancient Roman army'

cohort

 noun
     
co‧hort [countable]
1 someone's cohorts are their friends who support them and stay loyal to them - used in order to show disapproval:
Mark and his cohorts eventually emerged from the studio.
2 technical a group of people of the same age, social class etc, especially when they are being studied:
a cohort of 386 patients aged 65 plus
Definition from the Longman Dictionary of Contemporary English
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