As most words have more than one meaning, it is often impossible

As most words have more than one meaning, it is often impossible to tell the meaning of a word before it is used in( ).
【正确答案】：CONTEXT
【题目解析】：本题考查语境的重要性。大多数词都有一个以上的含义，所以一个词如果没有具体的语境就很难确定其意义。因为意义存在于语境之中，语境决定词义。context：语境。