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(science fiction) time machine
If a time machine existed, I would want to go back and correct my mistakes.
(computing) virtual machine
My virtual machine operates very quickly.
slot machine
I like playing with slot machines.
commodity, consumable, expendable
We purchase a lot of commodities every month.
attrition warfare
This war is likely to become a war of attrition.
necessary evil
He thinks that war is a necessary evil.
necessity (quality or state of being necessary, unavoidable, or absolutely requisite)
Do you understand the necessity of this project?
unnecessary
That information is unnecessary.
needlessness
That information is completely unnecessary.
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