As a noun, a regiment is a large military unit of soldiers. As a verb, to regiment means to organize people or things in a very strict, controlled way.
From Old French *regiment* (government, rule), from Latin *regimen* (rule), from *regere* (to rule). It moved from general rule to a specific military unit governed under strict rules.
A regiment is literally a group ‘under rule,’ which is why the verb means to control life down to the details. Boarding schools and armies are famous for regimented schedules where almost every minute is planned.
"Regiment" historically refers to a military unit, and many armies excluded women from combat regiments or confined them to auxiliary roles. Language around regiments has often defaulted to male soldiers as the norm.
When possible, use gender-neutral language for service members (e.g., "soldiers" rather than "men") and recognize the presence and contributions of women and gender-diverse personnel.
["unit","battalion","group"]
Note the contributions of women and gender minorities in regiments and related units, especially where their service was downplayed or recorded under male-centric terms.
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