1.Adverb24 hours per day, seven days per week. Designates 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."
2.AdverbConstantly, with little or no interruption; continually; very often.
"I'm ready to skydive twenty-four seven. [nonliteral, hyperbolic]"