The concept of transition in this regard is not solely the domain of transsexuals. People transition from school to working in the real world. People transition from one line of work to another. People transition from being babies to children to adults and so on. Transition means to move from one state to another. So we could be talking about Phase Transition of matter through its possible states [solid, liquid, gas, plasma, bosonic condensate, fermionic condensate]. Either way, the concept of transition is simply universal, but that when we are talking about transsexuals, transition means to change from one sex to another in the context to their target sex.
Now, I do have my own transition plans as a TG, but not from male to female, but from man [masculine] to what I wish to be [which I am still figuring out to a point, but it really have no single word to describe it other than androgyne]. But my transition probably won't entail SRS, it could entail HRT if certain therapists and endos are willing [which I know a few from friends], and a name change, a work change [in the respect that I may have to work as an independent contractor in systems development and analysis], and etc. I do definitely plan to get other kinds of surgeries [FFS, and other cosmetic surgeries] as well. None of these are at all exclusive to my transition, whereas your transition has one singular exclusive surgery which is often the big red dot center for all transsexuals: SRS.
-- Bridget