impaired or abnormal functioning of an item

Note 1 to entry: This term is built from the Greek prefix “dys” (i.e.” with difficulty”) and the Latin term “functio”

(i.e. an activity with a given aim). Primarily used in the medical field, this term is now often used within the

technological field as a more generic term than “failure” or “fault”.

Source: ISO/TR 12489:2013(E) Reliability modelling and calculation of safety systems. Global Standards

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