The crossword solution for the term 1/24 of a day is 'HOUR'. An HOUR is a unit of time that is equal to 60 minutes or 3, 600 seconds. It is commonly used to measure periods of time, such as the duration of an event or the intervals between events. In modern times, hours are usually represented using the 24-HOUR clock, in which the day runs from midnight to midnight and is divided into 24 hours. Therefore, 1/24 of a day is equal to one HOUR.