The word "elusive" can have a variety of meanings depending on how it's used. For example:
* Difficult to find or catch: "The elusive thief managed to escape the police again."
* Difficult to understand or define: "The concept of happiness is often elusive."
* Difficult to achieve or remember: "The elusive dream of a world without war."
Without the passage, I can only give you general definitions. Please share the context so I can give you a more precise answer.