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)