The word noon is derived from Latin nona hora, the ninth hour of the day, and is related to the liturgical term none. The Roman and Western European medieval monastic day began at 6:00 a.m. (06:00) by modern timekeeping, so the ninth hour started at what is now 3:00 p.m. (15:00). In English, the meaning of the word shifted to midday and the time gradually moved back to 12:00. The change began in the twelfth century and was fixed by the fourteenth century.[2]