Definition of chamberlain noun from the Oxford Advanced Learner's Dictionary

 

chamberlain

 noun
noun
BrE BrE//ˈtʃeɪmbəlɪn//
 
; NAmE NAmE//ˈtʃeɪmbərlɪn//
 
 
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an official who managed the home and servants of a king, queen or important family in the past Word Origin Middle English (denoting a servant in a bedchamber): via Old French from Old Saxon kamera, from Latin camera ‘vault’, from Greek kamara ‘object with an arched cover’.
See the Oxford Advanced American Dictionary entry: chamberlain