语义不明确包括多义（歧义）、模糊与概括（笼统）.
Semantic opacity covers such issues as ambiguity,vagueness and generality
definition of Vagueness is that:
The term “vagueness” seems very hard to be defined since different people have different views. As to the definition of vagueness, different linguists have given their different statements.
不过你可以去找找语言学书上一个叫Pierce的人~他定义过~