noun, plural bonuses.
something given or paid over and above what is due.
a sum of money granted or given to an employee, a returned soldier, etc., in addition to regular pay, usually in appreciation for work done, length of service, accumulated favors, etc.
something free, as an extra dividend, given by a corporation to a purchaser of its securities.
a premium paid for a loan, contract, etc.
something extra or additional given freely: Every purchaser of a pound of coffee received a box of cookies as a bonus.

1765–75; < Latin: good

1. reward, honorarium, gift. 2. Bonus, bounty, premium refer to something extra beyond a stipulated payment. A bonus is a gift to reward performance, paid either by a private employer or by a government: a bonus based on salary; a soldiers' bonus. A bounty is a public aid or reward offered to stimulate interest in a specific purpose or undertaking and to encourage performance: a bounty for killing wolves. A premium is usually something additional given as an inducement to buy, produce, or the like: a premium received with a magazine subscription. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bonus (ˈbəʊnəs)
1.  something given, paid, or received above what is due or expected: a Christmas bonus for all employees
2.  chiefly (Brit) an extra dividend allotted to shareholders out of profits
3.  (Brit) insurance a dividend, esp a percentage of net profits, distributed to policyholders either annually or when the policy matures
4.  (Brit) a slang word for a bribe
[C18: from Latin bonus (adj) good]

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

1773, "Stock Exchange Latin" [Weekley], from L. bonus "good" (adj.); see bene-. The correct noun form would be bonum. In U.S. history the bonus army was tens of thousands of World War I veterans and followers who marched on Washington, D.C., in 1932 demanding early redemption
of their service bonus certificates (which carried a maximum value of 5).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
These people actually get bonuses if they deny enough treatment to people who
  have paid for the coverage they are being denied.
Everybody's furious about the bonuses being paid out to finance folks, but
  nobody quite knows what to do about it.
Bonuses are also awarded for avoiding frequently-used queries.
We all are stuck, left, right and centre and they talk in millions and billions
  when it comes to paying bonuses to bank managers.
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