Definition - What does Demurrer mean?
A demurrer is when the defendant asserts that there is no merit in what the plaintiff is saying, even though they are not disputing what the plaintiff is saying. It is a type of assertion that basically means that there is no relevance to the matter in the truth of the subject being spoken of. It would be a type of fact that would not be considered in the wider context of a case because it was not directly related to the subject of the case.
Justipedia explains Demurrer
A demurrer is a quick way to deal with a statement made by the other side that is not disputed but that is noted to be irrelevant.