Pronunciation: (dis"u-grē'),[key] —v.i.,-greed, -gree•ing. 1. to fail to agree; differ: The conclusions disagree with the facts. The theories disagree in their basic premises. 2. to differ in opinion; dissent: Three of the judges disagreed with the verdict. 3. to quarrel: They disagreed violently and parted company. 4. to cause physical discomfort or ill effect (usually fol. by with): The oysters disagreed with her. Cold weather disagrees with me.