vuorokausi

Noun

 * 1) day, calendar day period from midnight to midnight, as one day of the calendar
 * 2) day, 24 hours period of 24 hours, as a unit of time
 * 3)  day rotational period of a planet

Usage notes

 * The word on Earth means a period of 24 hours; see also  which may also refer to the period of daylight.
 * In Finnish, is commonly used where English uses multiples of "24 hours":.