cohort
noun [ C, + sing/pl verb ] uk/ˈkəʊ.hɔːt/ us/ˈkoʊ.hɔːrt/
social science specialized有共同特点（通常指年龄）的一群人
a group of people who share a characteristic, usually age
This study followed up a cohort of 386 patients aged 65+ for six months after their discharge home. 这项研究对386位年龄在65岁以上、出院回家的患者进行了6个月的跟踪观察。
disapproving（通常指领袖的）追随者，支持者；党羽
a group of people who support a particular person, usually a leader
The Mayor and his cohorts have abused their positions of power. 市长和他的同党们滥用职权。