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diagnostic. adj. 1. (Medicine) of, relating to, or of value in diagnosis. 2. (Biology) of, relating to, or of value in diagnosis. n. 3. (Medicine) med any symptom that provides evidence for making a specific diagnosis. 4. (Medicine) a diagnosis. 5. (Biology) a diagnosis.
On-board diagnostics, or OBD, is an automotive term referring to a vehicle's self-diagnostic and reporting capability. OBD systems give the vehicle owner or a repair technician access to state of health information for various vehicle sub-systems.