From HomoExcelsior

1. Reversed in order, nature, or effect. 2. Of or relating to an inverse or an inverse function. 3. Turned upside down; inverted. 4. Something that is opposite, as in sequence or character; the reverse. 5. One of a pair of elements in a set whose result under the operation of the set is the identity element, especially: 6. multiplicative inverse 7. additive inverse

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