Wordnet 3.0
NOUN (1)
1.
the position of custodian;
The Collaborative International Dictionary of English v.0.48:
Custodianship \Cus*to"di*an*ship\, n.
Office or duty of a custodian.
[1913 Webster]
WordNet (r) 3.0 (2006):
custodianship
n 1: the position of custodian