24-houradjective [ before noun ]
ukusalso twenty-four houropen or available all day and all night without closing or stopping:
Share trading is now a 24-hour industry.
a 24-hour emergency line/helpline/hotline
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.
See also
24-hour clock
24-hour society