uptime uptilt • up to · · · Info · Definitions · Antonyms · Characters · · uptime · · Text Latin · · Script 6 · · Length 2 · · Syllables Definitions · · · (noun) a period of time when something (as a machine or factory) is functioning and available for use. · · Noun Definition 1 Antonyms · · · downtime · · Antonym 0 Characters · · e latin small letter e U+0065 i latin small letter i U+0069 m latin small letter m U+006D p latin small letter p U+0070 t latin small letter t U+0074 u latin small letter u U+0075