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uptime

American  
[uhp-tahym] / ˈʌpˌtaɪm /

noun

  1. the time during which a machine or piece of equipment, as a computer, is operating or can be operated.

  2. the time during which an employee is actually working.


uptime British  
/ ˈʌpˌtaɪm /

noun

  1. commerce time during which a machine, such as a computer, actually operates

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of uptime

1955–60; up (in sense “operating”) + time

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

While the industry’s “gold standard” is 99.999% uptime — known as “five nines,” which translates to just five minutes of downtime per year — Anthropic’s core services have recently hovered around 99.1%.

From MarketWatch May 6, 2026

As of April 8, Anthropic’s Claude API had a 98.95% uptime rate in the last 90 days.

From The Wall Street Journal Apr. 13, 2026

Proton VPN’s infrastructure is known for its reliability and uptime.

From Salon Mar. 21, 2026

Mr Fagernæs admits high winds will ground the drones occasionally, but expects the service to have 90% uptime.

From BBC Sep. 1, 2025

Unlike previous such grants, these insist on 95% uptime performance.

From Los Angeles Times Aug. 13, 2024

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