- Uptime is the time a machine, factory, website or service is functioning or “up.”
An example of uptime is the days in a year that a car assembly line was running.
(countable and uncountable, plural uptimes)
- (computing) The period of time a computer has functioned since last requiring a reboot.
up (adjective, computing) + time
uptime - Computer Definition
The time during which a machine or system is functioning properly. See also downtime.