• Webster's Revised Unabridged Dictionary
    • n Noncontent (British House of Lords) One who gives a negative vote; -- sometimes abridged into noncon. or non con.
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Century Dictionary and Cyclopedia
    • n noncontent In the House of Lords, one who gives a negative vote, as not being satisfied with the measure.
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In literature:

The contents were only forty-one: the noncontents fifty-five.
"The History of England from the Accession of James II." by Thomas Babington Macaulay
For, truth to tell, I've been a trifle dispirited and noncontent.
"The Letters of Ambrose Bierce" by Ambrose Bierce