Meanings
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1
noun
a tank or underground reservoir for collecting and storing water or another liquid
Rainwater from the roof drained into a stone cistern beside the house.
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2
noun
a tank that stores the water used to flush a toilet
A faulty valve caused the toilet cistern to refill continuously.
Thesaurus
Etymology
From Middle English cisterne, through Old French from Latin cisterna ("underground reservoir"), related to Latin cista ("box, chest") and ultimately Ancient Greek kistē. The toilet-tank sense is especially common in British English.