diagnostically

WordReference Random House Unabridged Dictionary of American English © 2026

di•ag•nos•tic  (dī′əg nos′tik), adj. 

1. of, pertaining to, or used in diagnosis.
2. serving to identify or characterize;
   being a precise indication.

n. 

3. Medicine diagnosis (def. 1).
4. Medicine a symptom or characteristic of value in diagnosis.
5. Medicine a device or substance used for the analysis or detection of diseases or other medical conditions.
6. Computing
   • a message output by a computer diagnosing an error in a computer program, computer system, or component device.
   • a program or subroutine that produces such messages.

• Greek diagnōstikós, equivalent. to diagnōst(ós) distinguished (akin to diágnōsis; see diagnosis) + -ikos -ic
• 1615–25

di′ag•nos′ti•cal•ly, adv.