A "twenty-four hour period" or a "day" can be expressed in various other words, depending on the context. It can be referred to as a "full day," "24-hour cycle," "diurnal cycle," "daytime," or simply "a day." In the medical field, it is called a "circadian rhythm," while in astronomy and geography, it is simply a "rotation." For those working typical business hours, they may describe it as a "workday" or a "business day." Conversely, for those who work non-traditional or overnight shifts, it may be called a "night shift" or a "graveyard shift." In essence, there are many synonyms for a "twenty-four hour period," each with its own connotation and intended meaning.