My dictionary's definition: transgender: adjective denoting or relating to a person whose self-identity does not conform unambiguously to conventional notions

My dictionary's definition: transgender: adjective denoting or relating to a person whose self-identity does not conform unambiguously to conventional notions of male or female gender. Though I agree that it clearly isn't a gender, it does seem like a sensible option to be included in a survey when asking about gender. Maybe they should have kept the options but rephrased the question? Edit: On second thought, I get it; you can be transgender and identify as male or female.