A magical effect or influence induced by an incantation or formula. Spells appear often in Fantasy literature and RPGs usually employed by Merlin-esque wizards.
The word spell is defined by M.-W. as "a spoken word or form of words held to have magic power" or "a state of enchantment".
It hails from Middle English (talk, tale) and from Old English; akin to Old High German spel=talk, tale.
First Known Use: 1579
Frequently, works of fiction have the spells be cast in some "strange" language (such as Harry Potter's Latin-like ones), or be based on "Old" speech.