A regiment is a military unit, consisting of a group of battalions, usually four and commanded by a colonel. Depending on mission, country of origin, and makeup, a modern regiment is similar to a brigade in size in that both range from a few hundred soldiers up to 2,000-3,000, depending on branch of service and method of organization. The modern unit varies in size, scope, administrative role from nation to nation, and within the armed forces of some nations.

The term came into use in Europe around the end of the 16th century, when armies evolved from a collection of retinues following knights to a more formally organized structure.

The regimental system

Administrative regiments are not part of the army's day-to-day operational command structure, but regimental ties are maintained by the administrative management of its members, and may include recruiting, basic training at a regimental centre, career management, postings, selection for special training, promotion boards, etc., for those in service. This system dates back to the Cardwell reforms in the United Kingdom, when each regiment was structured so as to have a battalion permanently overseas, while another battalion of the regiment was based at home to recruit and train replacements.

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