In discussions and stories covering TG/TS people, I often hear the terms like "biologically male/female" or "male/female genetically" or "was born a man/woman".
While I'm not really bothered by these terms, I do feel they're slightly inaccurate (if I may note, I'm a biology teacher). Unless this is an acquired condition at some point after our birth, then the cause is biological. Pretty much all the research I've seen indicates a biological origin while in the womb. The last I checked, neurology is a sub-field of biology.
So how can a trans woman be biologically male, when a significant part of her biology is female? In fact, I would consider our neurological components to be the only thing that really makes us who we are, with the rest of the body mainly supporting the mind and carrying out its commands. Consider, we view medical death as the point when the brain dies.
Now from a genetic standpoint, XY and XX chromosomes are only considered male and female because that's what they usually create. A person can't be genotypically male while phenotypically female, because the person's sex is their phenotype. And my own phenotype at birth was a mixture of male and female. After transition, the phenotypical male stuff is gone, leaving the rest phenotypically female. Or vice versa for others.
I prefer to use terms like "assigned male/female" or just leaving it at "an intersex condition" even though the medical community is lagging a bit on recognizing it as such.
At the end of the day, it's just terminology so I'm not worried about it as long as I can tell someone's trying to be respectful and understanding.