Official Definition: of, relating to, or being a person whose gender identity differs from the sex the person had or was identified as having at birth. -Merriam Webster Online Dictionary (Link: https://www.merriam-webster.com/dictionary/transgender).
Transgender: a gender description for someone who has transitioned (or is transitioning) from living as one gender to another. 2 adj. : an umbrella term for anyone whose sex assigned at birth and gender identity do not correspond in the expected way (e.g., someone who was assigned male at birth, but does not identify as a man). -https://www.itspronouncedmetrosexual.com/2013/01/a-comprehensive-list-of-lgbtq-term-definitions/