"Allhallown" is a curious word that is not commonly used today, but it does have its biblical roots. The word refers to All Saints' Day, which is observed on November 1st in various Christian churches. The spelling of "Allhallown" is phonetically transcribed as /ɔːlˈhælən/. The word's origin is Old English, splitting into "eall" meaning "all" and "halgian" which means "to make holy". Therefore, "Allhallown" means "to make all holy," representing the sanctity of the Christian holiday.
The word "Allhallown" is derived from the Middle English phrase "Al halȝe(n) euen" which means "All Saints' Eve". The term was later condensed to "All Hallow Even" and eventually evolved into the modern word "Halloween". "Allhallown" referred to the evening before All Saints' Day, which is observed on November 1st. The Old English word "ealra hālgena mæssedæg" was also used to describe this day, with "ealra hālgena" meaning "All Saints". Over time, as the pronunciation and spelling changed, "Allhallown" transformed into "Halloween", the widely recognized name for the holiday celebrated on October 31st.