noun
a tank for storing water, especially one supplying taps or as part of a flushing toilet system
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The ancient Roman cistern was a marvel of engineering, able to hold thousands of gallons of water.
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We found a hidden cistern in the backyard while digging for a new garden bed.
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Let's sneak a few beers into the cistern and have a secret party in the old ruins.
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Her mind was a cistern of memories, each one carefully stored and preserved for future reflection.