(v) To are not able to correspond: our numbers disagree. See Synonyms at differ.
(v) to own a differing opinion: She disagrees with him on everything. They do say it'll rain, but we disagree.
(v) To dispute or quarrel.
(v) never to agree (harmonize).
(v) never to concur (conform, match).
(v) not to concur (match).
To vary; be not similar or alike; be variant; to not accord or harmonize: as, two tips or two statements disagree when they're maybe not substantially identical, or when they're not quite alike; the witnesses disagree.
To differ in opinion; be at difference; show contrary views: as, best judges sometimes disagree.
to stay in a state of discord or altercation; wrangle; quarrel.
How would you define disagree?