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Encyclopedia-O

A-B-C-D-E-F-G-H-I-J-K-L-M-N-O-P-Q-R-S-T-U-V-W-X-Y-Z

O.W.Ls

Ordinary Wizarding Levels. The standard-level examinations at Hogwarts.

Obliviate

Memory spell that makes the subject forget a piece of information.

Obliviator

Member of an Accidental Magic Reversal Squad. They work for the Improper Use of Magic Office.

Occlumency

The magical defense of the mind against external penetration. An obscure branch of magic, but a highly useful one. Harry takes Occlumency lessons from Snape.

Ollivanders

Diagon Alley wand shop. 'Makers of Fine Wands since 382 B.C.'

Omnioculars

Binoculars with slow-motion and replay settings.

Oppugno

A spell that makes magical birds attack.

Order of the Phoenix, The

A secret society founded by Dumbledore dedicated to fighting against Lord Voldemort. Its first incarnation ended with Voldemort’s attempt to kill baby Harry and subsequent downfall; Dumbledore revived it after Harry’s fourth year to fight the rejuvenated Dark Lord and Death Eaters.