We all know that there's only one answer anyone will ever be happy with. Which is woman = biology only.
Let try a different angle:
What else, other than biology, can be added to the list of things that make you a woman or man?
Cutlery, clothes, trees, food, shoes, sideboards, fire escapes, make-up, pets, doorknobs? Any of these? None of these? What is it, other than biology? Chemistry? Physics? English? French? Geography? What?