denial, in psychology, an ego defense mechanism that operates unconsciously to resolve emotional conflict, and to allay anxiety by refusing to perceive the more unpleasant aspects of external reality. In the psychoanalytic theory of Sigmund Freud, denial is described as a primitive defense mechanism. Anna Freud studied the widespread occurrence of denial among small children and explained that the mature ego does not continue to make extensive use of denial, because it conflicts with the capacity to recognize and critically test reality. Most people employ denial at some time in their lives when coping with stressful situations, such as the death of a loved one. Elisabeth Kübler-Ross's influential theory describes denial as the first stage of a dying person's progress in coming to terms with terminal illness. In such instances, denial may be considered adaptive. It is considered maladaptive, however, when it becomes delusional. In recent years, the term is used more generally, to describe the suppression of reality rather than a particular defense mechanism in the Freudian sense.

Practice of the denial of physical or psychological desires in order to attain a spiritual ideal or goal. Most religions have some features of asceticism. The desire for ritual purity in order to come in contact with the divine, the need for atonement, and the wish to earn merit or gain access to supernatural powers all are reasons for ascetic practice. Christian hermits and monks, wandering Hindu ascetics, and Buddhist monks all reject worldly goods and practice various forms of self-denial, including celibacy, abstinence, and fasting. Members of the Digambara sect of Jainism practice an extreme form of asceticism that includes the rejection of wearing clothes. Though monasticism is rejected in the Qurhamzahān, ascetic movements such as zuhd have arisen in Islam. Zoroastrianism forbids fasting and mortification.

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