the time during which a machine or piece of equipment, as a computer, is operating or can be operated.
the time during which an employee is actually working.
Origin of uptime
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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