Deterioration, from Latin deteriorare "to make worse", can refer to any sort of worsening:

• attrition in general
• physical wear
• degeneration (medical)
• genetic deterioration

See also

• Degeneracy

A classic literature example of deterioration is the title character from William Shakespeare's play 'Othello'

In Materials science, wear is the erosion of material from a Solid Surface by the action of another substance Degeneration is Deterioration in the Medical Sense. Generally it is the change from a higher to a lower form Dysgenics (and cacogenics) describes a system of breeding wherein artificial Selection is for traits that are deleterious or perceived as ethically

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