(sometimes lowercase) British. a member of a legislative body, especially of the House of Commons, who has no special duties and is not a member of the ministry.
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Origin of Private Member
First recorded in 1600–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for private member
a member of a legislative assembly, such as the House of Commons, not having an appointment in the government
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012