Wordnet 3.0
NOUN (1)
1. 
 the imposition of a new organization; 
 organizing differently (often involving extensive and drastic changes); 
- Example: "a committee was appointed to oversee the reorganization of the curriculum"- Example: "top officials were forced out in the cabinet shakeup"[syn: reorganization, reorganisation, shake-up, shakeup]
WordNet (r) 3.0 (2006):
shake-up
    n 1: the imposition of a new organization; organizing
         differently (often involving extensive and drastic
         changes); "a committee was appointed to oversee the
         reorganization of the curriculum"; "top officials were
         forced out in the cabinet shakeup" [syn: reorganization,
         reorganisation, shake-up, shakeup]