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

 

marquess

 noun
(also marquis)noun
BrE BrE//ˈmɑːkwɪs//
 
; NAmE NAmE//ˈmɑːrkwɪs//
 
 
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(in Britain) a nobleman of high rank between an earl and a duke the Marquess of Bath compare marchioness Word Origin early 16th cent.: variant of marquis.
See the Oxford Advanced American Dictionary entry: marquess