HOUR, the twenty-fourth part of a civil day, the twelfth part of a natural day or night, a space of time of sixty minutes' duration. The word is derived through the O. Fr. ure, ore, houre, mod. heure, from Lat. hora, Gr. &pa, season, time of day, hour (see CALENDAR).
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)