[dey-byoo, di-, dey-byoo, deb-yoo]
a first public appearance on a stage, on television, etc.
the first appearance of something, as a new product.
(of a young woman) a formal introduction and entrance into society, as at an annual ball.
the beginning of a profession, career, etc.
verb (used without object)
to make a debut, as in society or in a performing art: She decided to debut with several other violinists.
to appear for the first time, as on the market: A new product will debut next month.
verb (used with object)
to perform (something) for the first time before an audience: He didn't know when the orchestra would debut his new symphony.
to place on the market for the first time; introduce.
of, pertaining to, or constituting a first appearance: a debut performance; a debut record album.
Also, début.

1745–55; < French début, derivative of débuter to make the first stroke in a game, make one's first appearance, equivalent to dé- de- + -buter, verbal derivative of but goal; see butt2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
debut (ˈdeɪbjuː, ˈdɛbjuː)
1.  a.  the first public appearance of an actor, musician, etc, or the first public presentation of a show
 b.  (as modifier): debut album
2.  the presentation of a debutante
3.  to make a debut
[C18: from French début, from Old French desbuter to play first (hence: make one's first appearance), from des-de- + but goal, target; see butt²]

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

1751, fig. sense from Fr. débuter "make the first stroke at billiards," also "to lead off at bowls" (a game akin to bowling), from but "mark, goal," from O.Fr. bot "end." The verb is first attested 1830.
"Début can only be pronounced as French, and should not be used by anyone who shrinks from the necessary effort." [Fowler]
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Today, of course, soft serve is not so glamorous or novel as it was when it first debuted.
Another interesting rehabilitation device that debuted this year is based on a modified game controller.
Debuted on the united world chart at number six and stayed there for four weeks.
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