noun, plural samurai. Japanese History.
a member of the hereditary warrior class in feudal Japan.
a retainer of a daimyo.

1720–30; < Japanese, earlier samurafi to serve, equivalent to sa- prefix + morafi watchfully wait (frequentative of mor- to guard) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
samurai (ˈsæmʊˌraɪ, ˈsæmjʊ-)
n , pl -rai
1.  the Japanese warrior caste that provided the administrative and fighting aristocracy from the 11th to the 19th centuries
2.  a member of this aristocracy
[C19: from Japanese]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1727, from Jap. samurai "warrior, knight," originally the military retainer of the daimio, variant of saburai, nominal form of sabura(h)u "to be in attendance, to serve."
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

samurai definition

A hacker who hires out for legal cracking jobs, snooping for factions in corporate political fights, lawyers pursuing privacy-rights and First Amendment cases, and other parties with legitimate reasons to need an electronic locksmith. In 1991, mainstream media reported the existence of a loose-knit culture of samurai that meets electronically on BBS systems, mostly bright teenagers with personal micros; they have modelled themselves explicitly on the historical samurai of Japan and on the "net cowboys" of William Gibson's cyberpunk novels. Those interviewed claim to adhere to a rigid ethic of loyalty to their employers and to disdain the vandalism and theft practiced by criminal crackers as beneath them and contrary to the hacker ethic; some quote Miyamoto Musashi's "Book of Five Rings", a classic of historical samurai doctrine, in support of these principles.
See also Stupids, social engineering, cracker, hacker ethic, and dark-side hacker.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
They weren't really samurai but a ragtag group who set up a militia.
It will, though, take a small miracle if the story of the stricken samurai horses is to have a happy ending.
Even today it makes samurai swords using time-honoured techniques.
Slicing apples in the air with a samurai sword took a year.
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