Definition from Wiktionary, the free dictionary
Shortened from "twenty-four hours a day, seven days a week."
- 24-hours per day, 7-days per week. A round-the-clock service, typically including holidays, as might be offered by a supermarket, ATM, gas station, concierge service or manned data center.
- They're open twenty-four seven; you can go there any time you want.
- (colloquial) Constantly, without interruption.
- twenty-five/eight (colloquial)