verb (used with object)
to overcome in a contest, election, battle, etc.; prevail over; vanquish: They defeated the enemy. She defeated her brother at tennis.
to frustrate; thwart.
to eliminate or deprive of something expected: The early returns defeated his hopes of election.
Law. to annul.
the act of overcoming in a contest: an overwhelming defeat of all opposition.
an instance of defeat; setback: He considered his defeat a personal affront.
an overthrow or overturning; vanquishment: the defeat of a government.
a bringing to naught; frustration: the defeat of all his hopes and dreams.
the act or event of being bested; losing: Defeat is not something she abides easily.
Archaic. undoing; destruction; ruin.

1325–75; Middle English defeten (v.) < Anglo-French, Old French desfait, past participle of desfaire to undo, destroy < Medieval Latin disfacere, equivalent to Latin dis- dis-1 + facere to do

defeater, noun
nondefeat, noun
predefeat, noun, verb
quasi-defeated, adjective
redefeat, verb, noun
undefeated, adjective
undefeatedly, adverb
undefeatedness, noun

1. overwhelm, overthrow, rout, check. Defeat, conquer, overcome, subdue imply gaining a victory or control over an opponent. Defeat suggests beating or frustrating: to defeat an enemy in battle. Conquer implies finally gaining control over, usually after a series of efforts or against systematic resistance: to conquer a country, one's inclinations. Overcome emphasizes surmounting difficulties in prevailing over an antagonist: to overcome opposition, bad habits. Subdue means to conquer so completely that resistance is broken: to subdue a rebellious spirit. 2. foil, baffle, balk. 7. downfall. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To undefeated
World English Dictionary
defeat (dɪˈfiːt)
1.  to overcome in a contest or competition; win a victory over
2.  to thwart or frustrate: this accident has defeated all his hopes of winning
3.  law to render null and void; annul
4.  the act of defeating or state of being defeated
5.  an instance of defeat
6.  overthrow or destruction
7.  law an annulment
[C14: from Old French desfait, from desfaire to undo, ruin, from des-dis-1 + faire to do, from Latin facere]

undefeated (ˌʌndɪˈfiːtɪd)
not having been defeated: the undefeated champion

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

late 14c., from Anglo-Norm. defeter, from O.Fr. defait, pp. of defaire, from V.L. *diffacere "undo, destroy," from L. dis- "un-, not" + facere "to do, perform" (see factitious). Original sense was of "bring ruination, cause destruction." Military sense of "conquer" is c.1600.

1775, from un- (1) "not" + pp. of defeat (v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
There were seasons that his team went entirely undefeated.
We have given you all you need to have an undefeated season.
At the end of the war both armies were able to regard themselves as undefeated.
Both teams entered the game undefeated in conference play.
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