Definitions
1.nounA bench at the back of a room or seating area.
2.nounA position of secondary importance.
3.noun(newspaper) A group of top-level journalists who jointly review submissions and decide on the layout and emphasis of the newspaper.
4.adjectiveRelating to the back benches in parliament"He prefers to be a backbench MP."
5.adjectivePertaining to the preparation of a donor organ prior to transplantation.
6.adjectiveSecondary or inactive.