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Originally a math term from abstract algebra roughly meaning "if you ignore differences depending on X." For instance, there are 8 ways to rotate or flip a square. But suppose you color one pair of opposite corners red, and the other pair green, and consider orientations of the square that look the same to be the same ("to modulo out by the relation that considers opposite corners to be the same"). Then rotating the square by 90 degrees becomes the same as flipping it horizontally or vertically, and rotating the square by 180 degrees becomes the same as doing nothing. Then there are only 2 ways to rotate or flip the square. Used colloquially by mathy people to mean, roughly, "if you ignore the fact that."
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