from Wiktionary, Creative Commons Attribution/Share-Alike License
- adv. Constantly, without interruption.
- adv. An abbreviation which stands for "24 hours a day, 7 days a week", including holidays and days otherwise that may alter limitations of work. In commerce and industry, it identifies a round-the-clock service, as might be offered by a supermarket, ATM, gas station, concierge service or manned data center.
Shortened from "twenty-four hours a day, seven days a week." (Wiktionary)