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diagnostics

American  
[dahy-uhg-nos-tiks] / ˈdaɪ əgˈnɒs tɪks /

noun

(used with a singular verb)

  1. the discipline or practice of diagnosis.

diagnostics British  
/ ˌdaɪəɡˈnɒstɪks /

noun

  1. (functioning as singular) the art or practice of diagnosis, esp of diseases

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of diagnostics

First recorded in 1660–70; diagnostic, -ics

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

But by some measures waiting time are actually up - the number of patients waiting longer than the target times for both diagnostics and therapies has risen to the highest on record since 2024.

From BBC • Mar. 19, 2026

You can choose to send app diagnostics to ExpressVPN, block IPv6 and adjust the app’s appearance.

From Salon • Mar. 13, 2026

One priority is developing diagnostics that can endure the intense radiation levels expected inside future fusion power plants.

From Science Daily • Mar. 3, 2026

Masimo will be a stand-alone operating company within Danaher’s diagnostics segment and is expected to deliver high-single digit core revenue growth over the long-term, the companies said.

From Barron's • Feb. 17, 2026

Physician recommended diagnostics and referred to specialist for ruling out infection or cancer.

From "The Immortal Life of Henrietta Lacks" by Rebecca Skloot

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.