Research
A group sharing a starting point (e.g. a year group) — or, in research, a group followed over time in a "cohort study."
The research sense is Merriam-Webster’s 2b: “a group of individuals having a statistical factor (such as age or class membership) in common in a demographic study”. The word is also “companion, colleague” and, originally, “one of 10 divisions of an ancient Roman legion” — from Latin cohors, first recorded in the fifteenth century in that military sense. The shared factor is what makes a cohort a cohort; a group assembled without one is a sample, not a cohort.
Merriam-Webster is cited as the dictionary of record: where an entry defines a word rather than a position, a dictionary is the primary source for it. The research usage above is this lexicon’s own.
From the AJG lexicon archive (July 2026).
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