Definition of "Spell" :

noun: a verbal formula believed to have magical force

"He whispered a spell as he moved his hands."

noun: a psychological state induced by (or as if induced by) a magical incantation

noun: a period of indeterminate length (usually short) marked by some action or condition

"A spell of good weather."

noun: a time period for working (after which you will be relieved by someone else)

"A spell of work."

verb: take turns working

"The workers spell every four hours."

verb: indicate or signify

"I'm afraid this spells trouble!."

verb: orally recite the letters of or give the spelling of

"How do you spell this word?."

verb: place under a spell

verb: write or name the letters that comprise the conventionally accepted form of (a word or part of a word)

"He spelled the word wrong in this letter."

verb: relieve (someone) from work by taking a turn

"She spelled her husband at the wheel."