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."