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inequation (??n??kwe???n) n (Mathematics) maths in mathematics or logic, a statement that two things are not equal; a formula with unequal sidesCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014