reliability

noun

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

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

Synonyms

• reliableness
• dependability
• responsibility
• trustworthiness
• solidity

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

Redundant systems ensure reliability and operational safety. —Aamir Khollam, Interesting Engineering, 13 Oct. 2025

But to reach the Moon and Mars and establish settlements on both, SpaceX will need its larger, more complex and significantly more powerful Starship and its Super Heavy booster to reach Falcon 9’s level of reliability and reusability. —Matthew Glasser, ABC News, 11 Oct. 2025

Office 2024 is designed for modern professionals who need seamless collaboration, offline reliability, and strong security. —PC Magazine, 11 Oct. 2025

The explosive report comes from NewsGuard, the respected information reliability firm. —Miami Herald, 10 Oct. 2025

Word History

First Known Use

1810, in the meaning defined at sense 1

Rhymes for reliability

• acceptability
• accessibility
• adaptability
• admissibility
• advisability
• affordability
• allowability
• amenability
• amiability
• appealability
• applicability
• availability

Kids Definition

reliability

noun

re·​li·​abil·​i·​ty ri-ˌlī-ə-ˈbil-ət-ē 

plural reliabilities

: the quality or state of being reliable

Medical Definition

reliability

noun

re·​li·​abil·​i·​ty ri-ˌlī-ə-ˈbil-ət-ē 

plural reliabilities

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