reliability

reliable +‎ -ity

reliability (usually uncountable, plural reliabilities)

1. The quality of being reliable, dependable, or trustworthy.
   • 2023 April 5, Philip Haigh, “Comment: Pay deal a positive result”, in RAIL, number 980, page 3:

     Above all, rail needs to be boring. By that, I mean that it must run its timetable reliably, day-in and day-out. Punctuality and reliability remain the bedrock of a successful railway.

   Synonym: dependable

   Synonym: unreliable

2. (education) the ability to measure the same thing consistently (of a measurement indicating the degree to which the measure is consistent); that is, repeated measurements would give the same result (See also validity).
3. (engineering) measurable time of work before failure