1) The act of disseizing 2) The state of being disseized 
• (n.) The act of disseizing; an unlawful dispossessing and ouster of a person actually seized of the freehold.
Dis·sei'zin noun [ Old French dessaisine .] (Law) The act of disseizing; an unlawful dispossessing and ouster of a person actually seized of the freehold. [ Written also disseisin .] Blackstone. 
the act of disseizing. · the state of being disseized.