> Even if our bodies don't develop properly or if we have developmental sex disorders we are all either male or female.
That's not what the actual developmental science says though.
The strong all humans are either male OR female by { unprovided definition } is simply incorrect.
> If you lookup biological adult, it's just someone who has completeled their reproductive development.
Sure. Some are born and develop into biological adult males. Others are born and develop into biological adult females. And others yet again are born and grow into adults who are neither one nor the other.
Look it up .. start with "intersex".
See your own first link, for example, it's really sloppy, and yet:
Although all cells have a sex, designated by the presence and dosage of X or Y chromosomes, which in most cases will be XX (female) or XY (male),
*
all cells will have a sex (okay ...)
* most will be XX (female) OR XY (male) (... okay)
* ... crickets ...
Nothing said about those cells that are neither male nor female.
All that aside, you have dodged the question.
What definition do you have for male, for female, and what do you designate the remainder?
Are you even aware that people are born who are neither male nor female by any of the generally accepted physical and genetic attributes?