re·​li·​abil·​i·​ty | \ri-ˌlī-ə-ˈbi-lə-tē \

Definition of reliability 

1 : the quality or state of being reliable

2 : the extent to which an experiment, test, or measuring procedure yields the same results on repeated trials

Keep scrolling for more

Examples of reliability in a Sentence

we never had reason to question the reliability of the park rangers in the event of an emergency

Recent Examples on the Web

To this day, many of the principles Mr. Heart emphasized — reliability, error resistance, and the capacity for self-correction — remain central to the Internet’s robustness. Katie Hafner,, "Frank Heart, 89, of Lexington; linked computers before the Internet," 26 June 2018 Bruce Walker, assistant secretary of electricity and energy reliability, said in an interview. James Osborne, San Antonio Express-News, "In coal fight, Perry switches his focus to pipeline cybersecurity," 25 June 2018 The deal seems speculative, as the Russian rocket industry is in flux as it is beset by outside competition and internal reliability problems. Eric Berger, Ars Technica, "Rocket Report: Chinese tourism, launch by centrifuge, SLS the “right” rocket," 22 June 2018 That line has the worst reliability record in the system, by some measures, with many troubles caused by the new signals. New York Times, "New Transit Chief’s Rapid Plan: Faster, Better, Cheaper," 23 May 2018 Brossett noted that the council has faced reliability issues with Entergy before, in the late 1990s and early 2000s. Kevin Litten,, "Entergy New Orleans could see penalties for power outages," 29 Mar. 2018 Still, the Defense Department is moving to accelerate contracting and production for the fighter despite the persistence of technical and reliability issues disclosed in the current phase of development testing. Anthony Capaccio,, "Efforts to Improve the F-35's Reliability Have Stalled, Pentagon Told," 24 Jan. 2018 Judge Martin Welch, who had denied Syed’s previous request for a new court date, said the original legal team should have raised more questions about the reliability of cellphone tower evidence. Talia Richman,, "Maryland's highest court to weigh in on Syed case," 12 July 2018 Trump's foreign policy, Kasich said, has made people concerned about the reliability of America as an ally. Marilyn Icsman,, "John Kasich slams Trump policies: 'That's not my country'," 12 July 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'reliability.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of reliability

1810, in the meaning defined at sense 1

Keep scrolling for more

Learn More about reliability

Share reliability

Statistics for reliability

Last Updated

5 Nov 2018

Look-up Popularity

Time Traveler for reliability

The first known use of reliability was in 1810

See more words from the same year

Keep scrolling for more

More Definitions for reliability


re·​li·​abil·​i·​ty | \ri-ˌlī-ə-ˈbi-lə-tē \

Kids Definition of reliability

: the quality or state of being fit to be trusted or relied on a car's reliability


re·​li·​abil·​i·​ty | \ri-ˌlī-ə-ˈbil-ət-ē \
plural reliabilities

Medical Definition of reliability 

: the extent to which an experiment, test, or measuring procedure yields the same results on repeated trials

Keep scrolling for more

Comments on reliability

What made you want to look up reliability? Please tell us where you read or heard it (including the quote, if possible).


something that serves to warn or remind

Get Word of the Day daily email!

Test Your Vocabulary

Autumn Words of the Day 2018

  • a-top-down-image-of-road-through-an-autumn-forest
  • Which is a synonym of fugacious?
Spell It

Can you spell these 10 commonly misspelled words?

Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!