• WordNet 3.6
    • n abrogator an authority or official empowered to abolish or annul or repeal
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Webster's Revised Unabridged Dictionary
    • n Abrogator One who repeals by authority.
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Century Dictionary and Cyclopedia
    • n abrogator One who abrogates or repeals.
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In literature:

The old magistracies and councils, meanwhile, are not abrogated.
"Renaissance in Italy, Volume 1 (of 7)" by John Addington Symonds
For, if they should grow to be frequent, in what would they differ from an abrogation of the rule itself?
"The Works of the Right Honourable Edmund Burke, Vol. VI. (of 12)" by Edmund Burke
Our treaty is now terminable on one year's notice, but propositions to abrogate it would be, in my judgment, most ill advised.
"A Compilation of the Messages and Papers of the Presidents" by Grover Cleveland
The next step in the plan of subversion, the 'abrogation of a government of majorities,' was carefully kept from the public view.
"Continental Monthly, Vol. II. July, 1862. No. 1." by Various
The General Assembly could have no power to abrogate a law passed by the three estates of the realm.
"Blackwood's Edinburgh Magazine -- Volume 55, No. 340, February, 1844" by Various
In November Raleigh was convicted of high-treason and his monopoly of American colonization was abrogated.
"England in America, 1580-1652" by Lyon Gardiner Tyler
Reinsurance treaties are abrogated unless invasion has made it impossible for the reinsured to find another reinsurer.
"World's War Events, Volume III" by Various
The reciprocity arrangement was abrogated, under notice from our government, in 1885, and the old contention was renewed.
"The Land We Live In" by Henry Mann
The convention assembled and the result was the abrogation of the old articles and the formation of the Constitution of the United States.
"Hidden Treasures" by Harry A. Lewis
These and such like he called to the peoples remembraunce, whereby they abrogated and deposed Tarquinius, banishing him, his wife, and children.
"The Palace of Pleasure, Volume 1" by William Painter

In news:

Philadelphia judge's verdict abrogates the state Castle Doctrine law.
A 2002 statute criminalizing resisting arrest didn't abrogate a citizen's common law right to resist illegal police conduct, the Michigan Supreme Court said.

In science:

There is an in principle contradiction in the logical structure of quantum field theory, if we want to include both internal an d external descriptions of measurement in the formalism (and quantum theory has always abrogated to itself the right to place the Heisenberg cut anywhere convenient).
Models of measurement for quantum fields and for classical continuous random fields