C1noun2K

Reliability

UK /["/rɪˌlaɪəˈbɪləti/"]/US /["/rɪˌlaɪəˈbɪləti/"]/

Definition

the quality of being able to be trusted to do what somebody wants or needs

In simple words: How trustworthy or dependable something is.

Examples

  • The incident cast doubt on her motives and reliability.
  • The reliability of these results has been questioned.
  • Lawyers sought to cast doubt on the reliability of her statements.
  • The aircraft has an exceptional record of reliability.

Usage notes

Use 'reliability' in discussions about performance, trust, and dependability. It's appropriate in both formal and casual contexts, but avoid it in overly casual conversations.

Grammar pattern

reliability + of + object

Memory hint

Think of 'rely' in 'reliability' — you rely on things that are dependable.

Collocations

  • reliability of systems
  • test reliability
  • brand reliability

Synonyms

  • dependability
  • trustworthiness
  • consistency
  • faithfulness
  • predictability

Antonyms

  • unreliability
  • instability
  • inconsistency

Common mistakes

  • Confused with 'reliant' which describes dependence.
  • Using 'reliability' incorrectly in plural form, e.g., 'reliabilities'.
  • Mixing up the meaning with 'belief' or 'hope'.