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Significavit is an obsolete writ in Englishecclesiastical law, issued out of chancery, that a man be excommunicated for forty days, and imprisoned until he submits himself to the authority of the church. It is synonymous with the writ de excommunicate capiendo.
References
"Significavit". Merriam-Webster. Retrieved 22 November 2021.
Bouvier, John; Rawle, Francis (1897). Bouvier's Law Dictionary. Boston: Boston Book Company.