1. a group of people with a shared characteristic, especially those born in the same year or participating in the same study
Usage: academic; statistical
2. a companion or associate, especially a partner in wrongdoing
Usage: often implies complicity
3. a division of a Roman legion consisting of 300 to 600 soldiers
Usage: historical; military

Examples

• The study followed a cohort of 1,000 children born in 1995.
• Researchers compared health outcomes across different age cohorts.
• The criminal and his cohorts were arrested after the robbery.
• She refused to join her cohorts in the cheating scheme.
• The Roman cohort marched through the conquered territory.
• Each cohort was commanded by a centurion.
• The birth cohort showed similar educational patterns.