In the Chrestomanci series
" is one of the classifications of magic-user recognised in World 12A
of the Related Worlds
Magician's magic is distinct from witchcraft, necromancy, wizardry, sorcery, and enchanter's magic; it is more powerful than basic witchcraft, but less powerful than enchanter's magic.
Some magicians are medical specialists, although it's not clear whether all medical specialists are magicians.