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An unconscious defense mechanism used to allay anxiety by denying the existence of important conflicts, troublesome impulses, events, actions, or illness.
Synonym(s): negation
[M.E., fr, O.Fr., fr. L. denegare, to say no]
Farlex Partner Medical Dictionary © Farlex 2012


A denial, contradiction, or negative statement.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


An unconscious defense mechanism used to allay anxiety by denying the existence of important conflicts or troublesome impulses.
Synonym(s): negation.
[M.E., fr, O.Fr., fr. L. denego, to say no]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

Patient discussion about negation

Q. is her2 positive more agressive than her2 negative? i know someone with her2 positive breast cancer and her doctor said it was more difficult to detect upon its return if it came back i want to know if it is true and what can she do to detect it earlier

A. Over-expression of her2/neu, a specific molecule in the breast cancer cell is indeed considered to convey worse prognosis, and suggest the need for chemotherapy and immunotherapy with Herceptin. However, the decision is much more complicated and should be made on case by case basis after consulting a professional.

Q. Rising PSA to 10 with two negative biospies? Expect cancer? 67 yrs old in good health otherwise.

A. High values don't always mean it's cancer. At 67 years old, you're prostate is most likely enlarging, resulting in the higher PSA results. And after two negative biopsies, it sounds like you're in the clear. Like Brandon said though, keep up with your regular check ups.

Q. Does the cooking have a negative effect on the protein content of the food? I have heard that high temperatures cooking breaks the protein, so does the cooking have a negative effect on the protein content of the food?

A. Yes. Proteins can be denatured by heat, but only when the protein structure is delicate or is exposed to extremely high temperatures for long time. You must remember that breaking of protein is the physical-chemical process where the physical or chemical structure of a protein is rearranged. So cooking will not reduce on the nutritive value of the food until it’s cooked at cooking temperatures.

More discussions about negation
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References in periodicals archive ?
In the characters' direct speech, three types of expressions as presupposition triggers (Levinson) are frequently found; the conditional "if," the conjunction "because," and negation. Table 2 indicates the number of occurrences of these three expressions and the discourse presentation categories in which they occur.
Horgan and Timmons attempt to solve this negation problem by distinguishing between two types of negation.
This is because, in each case, the same predicate ("exists") is attached to a grammatical subject ("no thing," in the one case, "a thing or kind of thing," in the other) said to be designated only by negation. A distinction between the two statements is impossible because difference requires a positive comparison, and thus at least one of the two grammatical subjects said to be different must be explicated in positive terms, that is, in terms of its features.
Along similar lines, the Estonian word combination ei 'negation verb/word' and the adverb kaas 'together, also' has shortened and assimilated into ega through the recorded history of Estonian (Metslang, Habicht, Pajusalu 2011; Metslang, Pajusalu, Habicht 2015 : 291-292).
Such counter-example has been provided by Georgiev himself, who pointed out that the law of double negation {equation (2>}, which is valid in the classical logic, is not valid any longer in intuitionistic fuzzy logic.
Even though this formulation is vague, it often allows us to decide when a rule with negation is supposed to fire.
While negation is rather evident in (9a), it is implicit in the other cases.
As we will see through a focus on the example of modern French emancipation, notions of nationality and of citizenship linked to the boundaries of modern nation-states produce, in relation to previous Jewish conceptions, a fundamental negation of exile.
As previously noticed by Ladd (1981), a sentence like (17) is ambiguous in the sense that it allows negation to be interpreted outside the proposition, as in (17a), or inside the proposition, as in (17b).
According to Sibley (2010), Historical Negation indexes the extent to which past injustices perpetrated against indigenous peoples by European colonisers are seen as relevant to resource allocation in contemporary society.