diagnostics

(′dī·əg′näs·tiks)

(engineering) Information on what tests a device has failed and how they were failed; used to aid in troubleshooting.

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(1) Software routines that test hardware components (memory, keyboard, disks, etc.). Diagnostics are often stored in ROM chips and activated on startup.

(2) Error messages in a programmer's source code that refer to statements or syntax that the compiler or assembler cannot understand.

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IN BRIEF: n. - The branch of medical science dealing with the classification of disease.

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The noun has one meaning:

Meaning #1: the branch of medical science dealing with the classification of disease
  Synonym: nosology

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