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

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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

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 How it’s built: Consumer Reports predicts the U.S. model attains a 4 out of 5 for reliability. Scott Sturgis,, "Traversing France in the Toyota C-HR Hybrid," 14 June 2018 But for whatever reason—probably the brand's reputation for reliability—the Giulia is a car not enough people consider when looking for a sporty sedan. Jonathan M. Gitlin, Ars Technica, "The Alfa Romeo Giulia Ti: A sports sedan for people who want to drive," 6 Apr. 2018 In a series of Twitter updates Wednesday, the executive director of Wikipedia’s parent company, Katherine Maher, echoed similar concerns about reliability. Jason Murdock, Newsweek, "YouTube Will Fight Spread of Conspiracy Videos With Links to Wikipedia," 14 Mar. 2018 Testing autonomous weapons for reliability is tricky. The Economist, "Autonomous weapons are a game-changer," 25 Jan. 2018 Toyota might be coasting on the success of being the world's largest automaker, known for reliability. Robert Duffer,, "Review: 2017 Toyota Highlander isn't as fresh as the three-row competition," 31 May 2017 Rocket companies like SpaceX sell their services based on confidence in the launch company, and will trade money for reliability. Joe Pappalardo, Popular Mechanics, "4 Things You Need to Know About SpaceX's Launchpad Disaster," 1 Sep. 2016

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.

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First Known Use of reliability

1810, in the meaning defined at sense 1

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Last Updated

22 Oct 2018

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Time Traveler for reliability

The first known use of reliability was in 1810

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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

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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).


a state of commotion or excitement

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