Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • intransitive v. To fail to correspond: our figures disagree. See Synonyms at differ.
  • intransitive v. To have a differing opinion: She disagrees with him on everything. They say it will rain, but I disagree.
  • intransitive v. To dispute or quarrel.
  • intransitive v. To cause adverse effects: Caffeine disagrees with me.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To not agree (harmonize).
  • v. To not agree (conform, correspond).
  • v. To not agree (suit).

from the GNU version of the Collaborative International Dictionary of English

  • intransitive v. To fail to accord; not to agree; to lack harmony; to differ; to be unlike; to be at variance.
  • intransitive v. To differ in opinion; to hold discordant views; to be at controversy; to quarrel.
  • intransitive v. To be unsuited; to have unfitness

from The Century Dictionary and Cyclopedia

  • To differ; be not the same or alike; be variant; not to accord or harmonize: as, two ideas or two statements disagree when they are not substantially identical, or when they are not exactly alike; the witnesses disagree.
  • To differ in opinion; be at variance; express contrary views: as, the best judges sometimes disagree.
  • To be in a state of discord or altercation; wrangle; quarrel.
  • To conflict in action or effect; be incompatible or unsuitable: as, food that disagrees with the stomach.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. be different from one another
  • v. be of different opinions

Etymologies

Middle English disagreen, from Old French desagreer : des-, dis- + agreer, to agree; see agree.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle English, from Anglo-Norman desagreer, as if dis- +‎ agree. (Wiktionary)

Examples

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