<Ul> <Li> 24 hours (exactly) </Li> <Li> The full day covering both the dark and light periods, beginning from the start of the dark period or from a point near the middle of the dark period </Li> <Li> A full dark and light period, sometimes called a nychthemeron in English, from the Greek for night - day; or more colloquially the term 24 hours . In other languages, 24 hours is also often used . Other languages also have a separate word for a full day . </Li> </Ul> <Li> 24 hours (exactly) </Li> <Li> The full day covering both the dark and light periods, beginning from the start of the dark period or from a point near the middle of the dark period </Li> <Li> A full dark and light period, sometimes called a nychthemeron in English, from the Greek for night - day; or more colloquially the term 24 hours . In other languages, 24 hours is also often used . Other languages also have a separate word for a full day . </Li>

What fraction of a week is one day