the fact that something is not related to what is being discussed or considered and therefore not important, or an example of this

Many of these problems may simply fade into irrelevance when the new rules come into force. 一旦新规则开始实施，这些问题大多可能就会变得无关紧要了。

Sympathy is an irrelevance - we need practical help. 同情无济于事——我们需要实际的帮助。

They spend too much time talking about irrelevancies, and not enough listening to other people.