Relating to a Roman military camp or the life and discipline of soldiers in a camp; military in character or organization.
From Latin 'castrensis' (relating to a camp), derived from 'castra' (camps), with the adjectival suffix '-ial' added in English.
Roman military writers used 'castrensial' discipline as the gold standard for organization—the idea that a well-ordered camp could prevent mutiny, disease, and desertion became the model for modern military structure.
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