formation (redirected from chiasma formation)

formation /for·ma·tion/ (for-ma´shun)

1. the process of giving shape or form; the creation of an entity, or of a structure of definite shape.

2. a structure of definite shape.

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reaction formation  a defense mechanism in which a person adopts conscious attitudes, interests, or feelings that are the opposites of their unconscious feelings, impulses, or wishes.

reticular formation  any of several diffuse networks of cells and fibers in the spinal cord and brainstem; subdivided into the reticular formations of the spinal cord, medulla oblongata, mesencephalon, and pons.

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for·ma·tion (fôr-mshn)

n.

1. The act or process of forming something or of taking form.

2. Something formed.

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formation

[fôrmā′shən]

1 a cluster of people who occupy and therefore define a quantum of space.

2 a structure, shape, or figure.

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formation [for-ma´shun]

1. the process of giving shape or form; the creation of an entity, or of a structure of definite shape.

2. a structure of definite shape.

chiasma formation the process by which a chiasma is formed; it is the cytologic basis of genetic recombination, or crossing over.

compromise formation in psychoanalysis a substituted idea or act representing and permitting partial expression of a repressed conflict.

concept formation the ability to organize a variety of information to form thoughts and ideas, a cognitive performance component in occupational therapy.

reaction formation a defense mechanism in which a person adopts conscious attitudes, interests, or feelings that are the opposites of unconscious feelings, impulses, or wishes. For example, a person may use revulsion or repugnance to defend against an unconscious desire or attraction.

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formation

1. the process of giving shape or form; the creation of an entity, or of a structure of definite shape.

2. a structure of definite shape.