- The definition of Halloween is a holiday celebrated in the U.S., Canada and the British Isles on October 31st where people dress in costumes and children go door to door asking for candy.
An example of Halloween is when children dress as ghosts and witches and go to neighbor's doors saying "Trick or treat!"
Children celebrating Halloween.
Halloween definition by Webster's New World
Origin: contr. ; from all hallow even (see Allhallows); hallow ; from Old English halga, definite form of halig (see holy) in sense “holy person, hence saint”
Halloween definition by American Heritage Dictionary
Origin: Short for All Hallow Even : Allhallow(mas) + even2.