: the house of more restricted membership in a legislative body having two chambers
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ˌupper ˈhouse [upper house] (also ˌupper ˈchamber) (also ˌsecond ˈchamber especially in BrE) noun singular
one of the parts of a parliament in countries which have a parliament that is divided into two parts. In Britain it is the House of Lords and in the US it is the Senate.
Useful english dictionary. 2012.