Princeton's WordNet

1. Halloween, Hallowe'en, Allhallows Eve(noun)

   the evening before All Saints' Day; often devoted to pranks played by young people

Kernerman English Learner's Dictionary

1. Halloween(noun)ˌhæl əˈwin, -oʊˈin, ˌhɒl-

   the 31st of October when people, especially children, celebrate by wearing costumes and getting candy

Wiktionary

1. Halloween(Noun)

   The eve of All Hallows' Day; 31st October; celebrated (mostly in the United Kingdom, Canada, United States and Ireland) by children going door-to-door in costume and demanding candy with menaces.

Origin: A shortening of Allhallow-even (Eve of All Saints).

Webster Dictionary

1. Halloween(noun)

   the evening preceding Allhallows or All Saints' Day

• AllerheiligeaandAfrikaans
• عيد جَميع القِدّيسينArabic
• Вси СветииBulgarian
• halloweenPortuguese (BR)
• HalloweenCzech
• der HalloweenGerman
• allehelgensaftenDanish
• γιορτή των Αγίων ΠάντωνGreek
• víspera de Todos los SantosSpanish
• kõikide pühakute päeva eelõhtuEstonian
• جشن هالووینFarsi
• pyhäinpäivän aattoFinnish
• HalloweenFrench
• לֵיל כָּל הַקדוֹשִׁיםHebrew
• 31अक्टूबर को मनाया जाने वाला ईसाई त्योहार जबकि बच्चे तरह-तरह के कपड़े पहनकर“ट्रिक एंड ट्रीट” खेलते हैंHindi
• predvecerje Svih svetih; Noc vješticaCroatian
• mindenszentek előestéjeHungarian
• malam menjelang perayaan 1 NovemberIndonesian
• HalloweenItalian
• お菓子ちょうだいJapanese
• 만성절(萬聖節) 전야의 축제, 핼로윈Korean
• Visų šventųjų šventės išvakarėsLithuanian
• Visu svēto dienas priekšvakarsLatvian
• halloweenMalay
• avond vóór AllerheiligenDutch
• جشن هالووینPersian
• (عيسوى ) ښه شپه، داولياوْشپه ( داكتوبر ٣١ نيټى شپهPashto
• канун Дня всех святыхRussian
• HalloweenSlovak
• Noć vešticaSerbian
• motsv dagen före allhelgonadagenSwedish
• ตอนเย็นหรือคืนวันที่ 31 ตุลาคม; วันปล่อยผีThai
• Azizler günü arefesi (31 Ekim), hortlak gecesiTurkish
• 萬聖節Chinese (Trad.)
• ХелоуінUkrainian
• آل سینٹس ڈے کا پہلا دنUrdu
• đêm trước ngày lễ các ThánhVietnamese
• 万圣节Chinese (Simp.)