Definition from Wiktionary, the free dictionary
- Pertaining to a siege.
1846–1847, Henry Edward Napier, “Miscellaneous Chapter for the Fifteenth Century”, in Florentine History, from the Earliest Authentic Records to the Accession of Ferdinand the Third, Grand Duke of Tuscany. [...] In Six Volumes, volume IV, London: Edward Moxon, OCLC 70326326, page 3:
- Nor was this strong geographical position her [Florence's] only bulwark; the capital itself in those unskilful days of obsidional tactics was deemed impregnable except through famine.
pertaining to a siege