from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun One who practices magic; a sorcerer or magician.
• noun A skilled or clever person.
• noun Archaic A sage.
• adjective Chiefly British Slang Excellent.
• adjective Archaic Of or relating to wizards or wizardry.

from The Century Dictionary.

• To effect by wizardry or enchantment.
• noun A wise man; a sage.
• noun A proficient in the occult sciences; an adept in the black art; one supposed to possess supernatural powers, generally from having leagued himself with the Evil One; a sorcerer; an enchanter; a magician; hence, a title occasionally applied to, or assumed by, modern performers of legerdemain; a conjuror; a juggler. See witch.
• Magic; having magical powers; enchanting: as, a wizard spell.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Enchanting; charming.
• adjective Haunted by wizards.
• noun obsolete A wise man; a sage.
• noun One devoted to the black art; a magician; a conjurer; a sorcerer; an enchanter.

from , Creative Commons Attribution/Share-Alike License.

• noun One who uses (or has skill with) magic, mystic items, and magical and mystical practices.
• noun One who is especially skilled or unusually talented in a particular field.
• noun computing A computer program or script used to simplify complex operations, often for an inexperienced user.
• noun Internet One of the administrators of a multi-user dungeon.
• adjective slang, dated, UK Fine, superb (originally RAF slang).
• verb intransitive To practice wizardry.
• verb transitive To conjure.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective possessing or using or characteristic of or appropriate to supernatural powers
• noun one who practices magic or sorcery
• noun someone who is dazzlingly skilled in any field