Late 15th century; earliest use found in Acts of Lords of Council in Civil Causes. From chamberlain + -ry, after Anglo-Norman chamberleinrie, chaumberlainerie, etc.
Definition of chamberlainry in US English:
chamberlainry
nounˈtʃeɪmbəlɪnri
Scottish rare, historical
The position or office of chamberlain.
Origin
Late 15th century; earliest use found in Acts of Lords of Council in Civil Causes. From chamberlain + -ry, after Anglo-Norman chamberleinrie, chaumberlainerie, etc.