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In ancient times, a cohort was a military unit, one of ten divisions in a Roman legion. The term passed into English in the 15th century, when it was used in translations and writings about Roman history. Once cohort became established in our language, its meaning was extended, first to refer to any body of troops, then to any group of individuals with something in common (as in “a cohort of law students” or “a cohort of people who were born in the same year”), and later to a single companion. Some writers on usage have objected to this last sense because it can be hard to tell whether the plural refers to different individuals or different groups. The “companion” sense is well established in standard use, however, and its meaning is clear enough in such sentences as “her cohorts came along with her to the game.”
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“Cohort.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cohort. Accessed 19 Sep. 2026.
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