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parity-operation

noun Physics.

space inversion.

Dictionary.com Unabridged

noun Physics.

the mathematical operation of reversing the directions of all three space coordinates. Symbol: P

Also called parity operation, space reflection.

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Parity-operation is always a great word to know.

So is slumgullion. Does it mean:

a stew of meat, vegetables, potatoes, etc.

a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.

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