What is Alienation Office?

Legal Definition
The Alienation Office (1576 - 1835) was a British Government body charged with regulating the 'alienation' or transfer of certain feudal lands in England by use of a licence to alienate granted by the king, during the feudal era, and by the government thereafter.
-- Wikipedia
Legal Definition
Engligh law. An office to which all writs of covenants and entries are carried for the recovery of fines levied thereon. See Alienate.
-- Bouviers Law Dictionary
Legal Definition
In English practice. An office for the recovery of fines levied upon writs of covenant and entries. Alienation pending a suit is void. 2 P. Wms. 482; 2 Atk. 174; 3 Atk. 392; 11 Ves. 194; Murray v. Baliow, 1 Johns. Ch. (N. Y.) 566, 580.
-- Black's Law Dictionary