A concise
word for referring to anything and everything within and behind the state, experience, theory, ideology, perspective, premise, perspective, belief,
philosophy, etc, of that which is, was, or can be "transgender".
It is simply the corollary of words like "homosexuality", "gayness", "lesbianism", or "bisexuality".
The
word itself has no positive or negative implication. Anyone who tells you that it does, is an overreactive activist.