Meaning of “24-hour” in the English Dictionary

"24-hour" in Business English

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24-houradjective [ before noun ]

uk us also twenty-four hour

open or available all day and all night without closing or stopping:

Share trading is now a 24-hour industry.
Responding to market pressure, they are offering 24-hour free telephone access.
He recalls the scepticism that greeted the notion of 24-hour opening for US supermarkets.

relating to one day, or happening only on one day:

The service can only be used once in a 24-hour period.
a 24-hour stoppage/strike Unified strike action spread over three twenty-four hour stoppages.

(Definition of “24-hour” from the Cambridge Business English Dictionary © Cambridge University Press)