from The Century Dictionary.

  • noun A clear or self-evident falsity; a statement or assertion the falsity of which is plainly apparent: opposed to truism.

from the GNU version of the Collaborative International Dictionary of English.

  • noun That which is evidently false; an assertion or statement the falsity of which is plainly apparent; -- opposed to truism.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A claim that is self-evidently false, commonly used a rhetorical device.


from Wiktionary, Creative Commons Attribution/Share-Alike License

false +‎ -ism modelled after truism


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  • His manner is aped by those who find an easy path to notoriety in imitation; the belief he held near his heart is worn as a creed like a badge; the truth he promulgated is distorted in a room of mirrors, half of it is a truism, the other half a falsism.

    Thomas Carlyle John Nichol 1863

  • In response to Wilkinson’s (I thought unexceptionable) assertion that people value things other than — and often more highly than — happiness, DeLong objected, not just that Will had said something substantively wrong, but made some kind of semantic error, asserting a tautological falsehood (what we used to call a “falsism” in debate):

    Better Brad DeLong Dissatisfied than a Pig Satisfied 2005


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