This is a guide to all the spells used so far in the HP books. This type of thing is very useful when writing fanfic (in my opinion anyway). If you see one that I've missed please notify me and tell me what the spell is and what it does. Thanks!
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Accio: brings objects to you
Alohomora: opens locks
Aparecium: reveals invisible ink
Avada Kedavra: the killing curse- use this and go to Azkaban for the rest of your days
Crucio: curse that gives unbearable pain to the victim- also forbidden and will give you a sentence to Azkaban
Delertius: makes things vanish
Densaugeo: used to cause rapid tooth growth
Diffindo: splits things
Engorgio: makes something bigger
Ennervate: wakes somebody who has been stunned or knocked out
Expecto Patronum: called the 'Patronus', this spell repels dementors with a wave of happiness
Expelliarmus: disarms your opponent by taking away their wand
Ferula: makes a splint
Finite Incantatem: stops spells coming your way, except for the Forbidden Curses (I believe. Anybody know about this one?)
Furnunculus: gives red, blotchy boils all over skin
Impedimenta: slows something down
Imperio: curse that allows you to control somebody- also forbidden and will send you to Azkaban
Impervius: makes something water proof
Incendio: starts a fire
Locomotor Mortis: makes your legs snap together and unable to move as if you were bound by ropes
Lumos: makes light
Mobilarbus: enables objects to hover off the ground
Mobilicorpus: similar to 'Locomotor Mortis', except it works on the whole body
Nox: gets rid of light caused by 'Lumos'
Obliviate: erases memory
Orchideous: makes your wand shoot flowers
Petrificus Totalus: fully binds someone's body (similar to 'Mobilcorpus')
Point Me: Points your wand north
Priori Incanto: shows the prior spells done by a wand
Quietus: disables 'Sonorus'
Reducio: makes things shrink
Reducto: blows things up pretty much
Relashio: scares away grindylows
Reparo: repairs objects
Rictusempra: makes you feel like you've been punched
Riddikulus: Boggart spell, used to help make it look funny
Serpensortia: summons a snake
Sonorus: magnifies one's voice
Stupefy: stuns
Tarantallegra: makes something dance
Waddiwasi: used to unclog holes
Wingardium Leviosa: enables objects to fly
