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

  • intransitive v. To associate with others in a brotherly or congenial way.
  • intransitive v. To associate on friendly terms with an enemy or opposing group, often in violation of discipline or orders.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To associate with others in a brotherly or friendly manner;
  • v. To associate as friends with an enemy, in violation of duty

from the GNU version of the Collaborative International Dictionary of English

  • intransitive v. To associate or hold fellowship as brothers, or as men of like occupation or character; to have brotherly feelings.
  • transitive v. To bring into fellowship or brotherly sympathy.

from The Century Dictionary and Cyclopedia

  • To associate, sympathize, or hold fellowship as brothers; hold brotherly intercourse; have sympathetic relations.
  • To bring into fraternal association or into sympathy.
  • Also spelled fraternise.

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

  • v. be on friendly terms with someone, as if with a brother, especially with an enemy


French fraterniser, from Medieval Latin frāternizāre, from Latin frāternus, fraternal; see fraternal.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin, literally "to make brothers" (Wiktionary)



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