1. 
[syn: captivity, imprisonment, incarceration, immurement]
The Collaborative International Dictionary of English v.0.48:
Immurement \Im*mure"ment\, n.
   The act of immuring, or the state of being immured;
   imprisonment.
   [1913 Webster]
WordNet (r) 3.0 (2006):
immurement
    n 1: the state of being imprisoned; "he was held in captivity
         until he died"; "the imprisonment of captured soldiers";
         "his ignominious incarceration in the local jail"; "he
         practiced the immurement of his enemies in the castle
         dungeon" [syn: captivity, imprisonment,
         incarceration, immurement]