Source : Webster's Revised Unabridged Dictionary (1913)

Immurement \Im*mure"ment\, n.
   The act iif immuring, or the state of being immured;
   imprsonment.

Source : WordNet®

immurement
     n : 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}]