The definition of transgender probably does need some discussion and clarification as it's become meaningless and damaging to some transexuals.
Having spent a lot of time debating these issues on Twitter, my thoughts on all these issues have crystallised in my mind as I now refuse to use any language other than that which is sex appropriate. The more I use clear language, the simpler it becomes to express the problems I see. And that applies to “trans” as much as it applies to “woman” or “male”.
Personally I find it helpful to revert to a point where trans stops being some wishy-washy inside-someone’s-head concept and returns to what it really is: a controversial treatment for gender dysphoria. So a trans person to me, is anyone who has undergone that specific treatment process in a meaningful way.
So in the same way I refer to anyone male as a man, a transitioner is a person who has undergone a medical process in an attempt to reduce dysphoria by treating the body so that it more closely resembles the opposite sex.
So for me that goes hand in hand with use of straightforward language. The whole purpose of the shifting language is to throw us off balance and I refuse to use it. I think perhaps we are in a difficult position as especially online, there have been huge attempts to change the meaning. But as others have implied, the huge majority of people still consider the definition I have given to be correct.
Part of the transactivism trick has been to change the meaning only in the places where power is flexed. Thus they push for laws using their new definition while the majority of the population believe something entirely different is happening.
Definitions matter in this debate, perhaps more than in any other that has gone before. So the more we speak plainly and point out the truth, the better.
And once we have clear definitions, perhaps then we can discuss again whether the groups involved need any special dispensations. But this time all affected parties should be involved in the debate. Transsexuality cannot be used again as a wedge for placing males in women’s spaces.