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From the Glossary
Having reproductive and/or sexual anatomy that doesn’t seem to, or isn’t understood to, fit typical definitions of female or male, and/or chromosomal combinations other than XX or XY.
Intersex is a socially constructed category that reflects real biological variation. Some intersex conditions are Turner Syndrome, Androgen Insensitivity Syndrome, Klinefelter’s Syndrome, MRKH and Congenital Adrenal Hyperplasia.