1. (noun)ace, adept, champion, sensation, maven, mavin, virtuoso, genius, hotshot, star, superstar, whiz, whizz, wizard, wiz someone who is dazzlingly skilled in any field
2. (adj)sorcerer, magician, wizard, necromancer, thaumaturge, thaumaturgist one who practices magic or sorcery
3. (adj)charming, magic, magical, sorcerous, witching(a), wizard(a), wizardly possessing or using or characteristic of or appropriate to supernatural powers "charming incantations"; "magic signs that protect against adverse influence"; "a magical spell"; "'tis now the very witching time of night"- Shakespeare; "wizard wands"; "wizardly powers"
2. The term ‘wizard’ is also used intransitively of
someone who has extremely high-level hacking or problem-solving
ability.
3. A person who is permitted to do things forbidden to ordinary
people; one who has wheel privileges on a system.
4. A Unix expert, esp. a Unix systems programmer. This usage is
wellenough established that ‘Unix Wizard’ is a recognized job
title at some corporations and to most headhunters.