WordNet (r) 3.0 (2006):

taking over
    n 1: acquisition of property by descent or by will [syn:
         succession, taking over]

Moby Thesaurus II by Grady Ward, 1.0:

31 Moby Thesaurus words for "taking over":
   accession, adoption, anointing, anointment, appointment,
   appropriation, arrogation, assignment, assumption, authorization,
   colonization, conquest, consecration, coronation, delegation,
   deputation, election, empowerment, enslavement, indent,
   legitimate succession, occupation, preemption, preoccupation,
   prepossession, requisition, seizure, subjugation, succession,
   takeover, usurpation