twenty-four/seven

Short definition from Wiktionary

Adverb

1. 1
   Alternative form of twenty-four seven.
2. 2
   24 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.
3. 3
   Constantly, with little or no interruption; continually; very often.

Noun

1. 1
   Alternative form of twenty-four seven.

Adjective

1. 1
   Alternative form of twenty-four seven.