Wordnet 3.0
NOUN (1)
1. 
 time for Earth to make a complete rotation on its axis; 
- Example: "two days later they left"- Example: "they put on two performances every day"- Example: "there are 30,000 passengers per day"[syn: day, twenty-four hours, twenty-four hour period, 24-hour interval, solar day, mean solar day]
WordNet (r) 3.0 (2006):
24-hour interval
    n 1: time for Earth to make a complete rotation on its axis;
         "two days later they left"; "they put on two performances
         every day"; "there are 30,000 passengers per day" [syn:
         day, twenty-four hours, twenty-four hour period,
         24-hour interval, solar day, mean solar day]