The office, position, or rank of an adjutant in a military organization; the duties or period of service of an adjutant.
From 'adjutant' (from Latin 'adjutans,' present participle of 'adjuvare,' to help) + -cy suffix. This administrative military rank became standardized in European armies during the 17th century.
An adjutant's adjutancy could make or break a regiment—these officers managed logistics, communications, and discipline, and capable ones were so valuable that generals would bring their adjutants from posting to posting.
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