Wiktionary
n. One of the two parts of a parliament in some countries.
Wikipedia
An upper house, sometimes called a Senate, is one of two chambers of a bicameral legislature (or one of three chambers of a tricameral legislature), the other chamber being the lower house. The house formally designated as the upper house is usually smaller, and often has more restricted power, than the lower house. Examples of upper houses in countries include the UK's House of Lords, Canada's Senate, India's Rajya Sabha, Russia's Federation Council, Ireland's Seanad and the United States Senate.
A legislature composed of only one house (and which therefore has neither an upper house nor a lower house) is described as unicameral.
Usage examples of "upper house".
There were only a few Parlimins still in office who had also served during Cavanagh's stint here, but the current trend among the national and state governments of the NorCoord Union was to appoint top business and industrial leaders to the upper house, and Cavanagh spotted several men and women he'd locked horns with across tables over the years.
He had no right even to speak uninvited, unless he decided to impose his one real power, his outright veto over a council recommendation to the upper house, the tashrid—.
Four sisters from the upper house, four from the lower, and two complete families from the Defenders' House that they could still count on, not to mention all the usual clerical staff, special advisors, official recorders, and a pair of journalist sisters with their noters.