1. There is no justification for his absence.
    他没有理由缺席。

2. justification的近义词

2. What can be said in justification of what he had done?
    能说些什么来为他做下的事辩护呢？

1. 合理化：基于这个理论,使用记号的行为可以援引规则来得到合理化(justification),而这种合理化的结果是,我们说这个记号是有意义的. 这样,我们就得到一种关于意义的二分理论,一方面是无意义的、物理的记号,另一方面,是赋予记号以意义的规则,

1. 正当理由；合理的解释
    A justification for something is an acceptable reason or explanation for it.

    e.g. To me the only justification for a zoo is educational...
           对我来说，动物园存在的唯一正当理由是其教育作用。
    e.g. I knew from the beginning that there was no justification for what I was doing.
           我从一开始就知道我的所作所为毫无道理。