a violent demonstration of rage or frustration; a sudden burst of ill temper.

1740–50; origin uncertain

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World English Dictionary
tantrum (ˈtæntrəm)
(often plural) a childish fit of rage; outburst of bad temper
[C18: of unknown origin]

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Dictionary.com's 21st Century Lexicon
Main Entry:  tantrum
Part of Speech:  n
Definition:  See temper tantrum
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Word Origin & History

1714, originally colloquial, of unknown origin.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

tantrum tan·trum (tān'trəm)
A fit of bad temper.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Data that doesn't fit your case, gets a temper tantrum.
And when the consequences happened, she would have an hourlong temper tantrum.
It's an emotional revenge-oriented tantrum that shares certain characteristics
  with violent criminal behavior itself.
The little one throws a tantrum, the older one yells at her.
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