I think that if you're going to try to redefine a word, that it's only polite to provide a new definition at least, since words mean things.
I would be universally acknowledged by people on the street as a woman. So that new definition needs to include me. My partner would be clearly seen as a man, so it needs to exclude him.
Transwomen would like it to include them, and transmen would like it to exclude them, so it's getting tougher.
Some fuzziness is OK at the edges (eg. intersex) - because these things are disorders that are, by their definition, fuzzy around sex.
It obviously can't be circular, as that's not a definition.
It's the foundation upon which the definitions of feminism and lesbianism are going to be then built - so it's bloody important.
It's going to affect existing laws, already written with the conventional definition in mind
What is this new definition? Please, there's been a lot of talking about this, it's really important, what is the definition? Snappity?