Etymology
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transgender (adj.)

also trans-gender, by 1974 in reference to persons whose sense of personal identity does not correspond with their anatomical sex, from trans- + gender (n.). Related: Transgendered.

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cisgender (adj.)

also cis-gender, "not transgender," in general use by 2011, in the jargon of psychological journals from 1990s, from cis- "on this side of" + gender.

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