Harry Potter Spells (and their potential etymology)

Thanks to growing up learning Latin in school (mandatory), my brain is wired so that it picks up on Latin looking stuff and won't let go of it. And since I love the world of Harry Potter, in which most of the spells are Latin based, I decided to go ahead and find the most likely origins of each spell's incantation.
Please note that any non-Latin origins are approximation guess work. Everything you see should be taken with a grain of salt, not hard fact, as I'm not Rowling and I don't know her exact process for forming spell incantations.
This will be organized alphabetically and will be grouped by first letter. Any spells we know of, but don't have a confirmed incantation for will not be listed (such as the Age Line, Ears to Kumquats, Fiendfyre, Horcrux, Pack, Unbreakable Vow, and other such things).
If you are interested in my list of made up incantations for the previously mentioned excluded magic, there will be / is a poll after the entire alphabet (all by itself as it's own chapter).