zirhttp://www.oed.com/dictionary/zir_adj%3Ftab%3Dmeaning_and_usezir, adj.
First published 2019

ziradjective

  1. 1993–
    Used as a gender-neutral possessive adjective (determiner), corresponding to the subjective pronoun ze (ze pron.). Cf. zir pron.
    Used as an alternative to his or her in contexts where a person's gender is undetermined, and also by or for individuals who do not identify themselves as either male or female, but rather as another or no gender, or as a combination of genders.
    1. 1993
      I do want my partner to be doing something with zir life.
      Re: Women going for Guys/Money? in soc.singles 6 December (Usenet newsgroup, accessed 16 Aug. 2018)
    2. 2007
      Zie put zir finger in zir mouth.
      C. Phair, Nightmare in Silicon xii. 73
    3. 2018
      Seriously, what kind of nerd quotes zir own book. I'm just saying.
      @Kris_Ripper 18 July in twitter.com (accessed 16 Aug. 2018)

zir, adj. was first published in March 2019.

zir, adj. was last modified in December 2023.