Definition of “upper house” - English Dictionary

british dictionary

“upper house” in British English

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upper housenoun [ C usually singular ]

uk /ˌʌp.ə ˈhaʊs/ us /ˌʌp.ɚ ˈhaʊs/ also upper chamber

one of the two parts that some parliaments are divided into:

In the UK, the upper house is the House of Lords.
The upper house of the US Congress is the Senate.

(Definition of “upper house” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)