What makes a woman?

Is it your vagina? The fact you were born with a uterus? Your ability to bear and birth a child? What is it that makes a woman?

I ask this question because I've seen many (if not too many) posts on here and other forums about trans folx and for whatever reason it seems people only judge a person by their genitals. So I'd like to know, what do you believe makes a woman?

I find it very disappointing that people feel the right to diminish trans folx to their genitals. I'm inclined to agree with Laverne Cox that these bathroom issues are not just about peeing in public, it's about whether or not trans people are welcomed in public and have a right to be a part of society.

So I ask you again, what makes someone a woman?