Definition of Fresh disseisin
By the ancient common law, where a man had been disseised, he was allowed to right himself by force, by ejecting the disseisor from the premises, without resort to law, provided this was done forthwith, while the disseisin was fresh (flagrante disseisina).
That's the definition of Fresh disseisin in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.