And like you asked I am asking you for your explanation. You called me a coward for not giving mine.
So lets have it.
I just have. It's quite simple. When talking in a biological context, such as here when discussing pregnancy and abortion, a woman is an adult female human producing eggs and possessing a uterus.
When talking in a social context about issues such as gender identity , a woman is an adult who lives as and identifies as female, though they may have been said to have a different gender at birth.
There are some contexts where these two definitions are both relevant, such as discussion over so-called female only spaces. When clarification is required the prefix cis is used to indicate an adult living as and identifying as female, who has always been identified as female. The prefix trans is used to indicate a woman who was said to be male at birth but now lives as and identifies as female.
Further clarification can be gained be reference to an individuals birth certificate or passport, though personally I can't see any reason for this in normal interaction .
Other definitions of woman include its use as a suffix as in craftswoman, though this is decreasing in use. Also as a representation of women in general, e.g. "As a woman I consider that..."
I suspect that you do not fully agree with these definitions, but tough. Words are used to convey ideas and concepts, both real and imaginary . Whether one agrees doesn't matter, the word remains useful. I have no problem using the word God, for example, even though I don't believe that the concept or idea conveyed by God. Refusing to accept the existence of the word would be ridiculous. Even more ridiculous would be refusing to accept the word Christian, on the grounds that they are living a life fe based on a non-existent concept. Christians exist, whatever I might feel about whether or not they should exist.
The same applies to transwomen. You might not believe that changing gender is possible or desirable, but the concept and idea exist and has a word to describe it. Similarly there are people who live that concept. Adults who live as and identify as women, and who are officially recognised as women, who were said to be male at birth, do exist. Not using the readily available word to describe them would be ridiculous, whatever your views on whether they should exist.