Jiang, you're quite confused.  Where does it say I've backed off?  I cited Fairbanks as a prime example of someone who uses it in the third sense.  You've also quite erroneously mixed up what wikipedia policy says about definitions.  The intent is to prevent extremely short articles, and for them, it suggests that you extend them.  It also tries to group very related terms together.  Chinese Republic is related to different things, depending on the context of where a person might have read about it or what point of view the person is coming from.  Republican China, for example, we agreed to point to History of the ROC since it is most appropriate for someone looking for something about .  But for someone who says Chinese Republic means the ROC exactly, we can't point him there, we have to point him towards ROC.  And then there's the third definiton that means something else entirely.