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Definition of Contragredient
1. Adjective. (mathematics) Generally, an object contragredient to another is the object inversed and transposed. ¹
2. Adjective. (mathematics) A contragredient representation in linear algebra is the transpose of the former representation of an inverse object. ¹
3. Adjective. (mathematics) A contragredient matrix is a transpose of an inverse matrix. ¹
¹ Source: wiktionary.com