In Westminster parliamentary systems, a backbencher is a Member of Parliament (MP) or a legislator who holds no governmental office and is not a frontbench spokesperson in the Opposition, being instead simply a member of the `rank and file`. The term dates from 1855. A backbencher may be a new parliamentary member yet to receive high office, a s..... Found on http://en.wikipedia.org/wiki/Backbencher
A rank and file council member, as opposed to a member of a council's decision-making executive. Backbenchers vote on their local authority's policy framework and sit on scrutiny committees, as well as representing their constituents.
Found on http://society.guardian.co.uk/glossary/page/0,,646470,00.html
Members of Parliament on the government side who sit on the backbenches and are not in cabinet, or those similarly distant from shadow cabinet posts in opposition parties. Found on http://polisci.nelson.com/glossary.html