The Summoning Charm. It attracts an object to the caster. Knowing the object's general location is vital. The necessary incantation is "Accio", along with a firm mental picture of the object in question. When the object is out of sight, it is usually supplemented by the name of the requested object (e.g. "Accio Broomstick") for easier visualization. It is likely to have come frome the Latin "Accipere, to accept".It was first used by Mrs. Weasley in GoF to summon all the Ton-Tongue Toffees from all sorts of unlikely places, including the lining of George's jacket and the turn-ups of Fred's jeans.
The spell may also be used in conjunction with the name of the owner of the object, to clearly specify the object that the caster wishes to retrieve. This is demonstrated by Professor Dumbledore in Harry Potter and the Half-Blood Prince where he attracts Madam Rosmerta's broomsticks by reciting the incantation of "Accio Rosmerta's Brooms!".
The charm sends a stream of water from the tip of the wand. The prefix is derived from the Latin word, aqua, meaning "water". The water may come out in various amounts. Once, Harry performed the spell to put out the fire on Hagrid's hut (must have been a huge jet of pounding water) and another time to fill a goblet (must have been a gentle stream of water). This shows that the volume of water conjured from Aguamenti can be controlled. In Harry Potter and the Half-Blood Prince, Harry Potter may have used it nonverbally to refill bottles surreptitiously with the help of the luck potion, Felix Felicis, escaping notice of Professors Horace Slughorn and Rubeus Hagrid, but this is not certain as it was merely referred to as "the refilling charm".
This spell is used to open a locked door or window. Pointing a wand at a door and saying "Alohomora" will unlock the door. Probably a compressed form of Latin "Alo hoc mora" = English "I raise this barrier." This spell was first used by Hermione in Harry Potter and the Philosopher's Stone when she, Ron, and Harry are escaping from Argus Filch. It helps get them to the room where they find Fluffy. This spell can also open doors which have been magically sealed with the Colloportus spell. Doors can be magically sealed with sufficiently advanced spells so that Alohomora cannot open them, such as the door in the flying key room in Harry Potter and the Philosopher's Stone and the main gate to the Hogwarts grounds as seen in Harry Potter and the Half-Blood Prince.
This spell was used to dislodge a pheasant from Marcus Belby's throat in Harry Potter and the Half-Blood Prince. Appears to be an Anti-Choking spell of some sort. The word is Greek and means "I breathe" so this spell is seemingly used to make or help someone breathe. The word also shares its root with Apnea, a disorder in which one's breathing becomes irregular during sleep; the prefix an- is an analog to non- or dis-.
This spell makes invisible ink and perhaps invisible items in general appear. First used in CoS when Hermione Granger tried to make something appear in Tom Riddle's diary. See also Specialis Revelio.
Makes birds fly out of the wand of the spellcaster. Used in GoF by Mr Ollivander to test Viktor Krum's wand. It is also possible that this is the spell used by Hermione Granger in Harry Potter and the Half-Blood Prince to summon canaries. If so, the incantation Oppugno makes birds summoned this way attack. Avis in Latin means "bird" and along with many other spells is in a similar but different language.
