oomis, there is no source for that definition other than your boich teitch. An agunah is a woman who’s husband is lost (i.e. at sea) and his whereabouts unknown. Not one who would like a get but doesn’t get it.
The correct term for a woman who has a halachicly valid reason to demand a get, and based on that a beis din orders the husband to give one and he refuses, is a “mesorevet get” not an agunah.