Etymology of 'Accio' and more

[ibchawz]

No: HPFGUIDX 160862

Potioncat:

Now after all this, it's back to the buffalo. If Seamus and Ron and
Hagrid and Draco all have different accents, how do they manage the
spells? Or does it work just fine so long as they each pronounce
accio consistently within their own speech patterns?

ibchawz responds:

I'm not sure this will clear anything up.  It may raise more 
questions than it answers...

In SS/PS, Hermione corrects Ron for not pronouncing the "Leviosa" 
part correctly and she is the first to successfully perform the 
Wingardium Leviosa charm.  In addition, the Wizard Baruffio / 
buffalo bit of wisdom from Professor Flitwick indicates that proper 
pronunciation is required.

On the other hand, the classes in HBP deal with nonverbal spells.  
Obviously, pronunciation would not matter if you are not saying 
anything.  With nonverbal spells, it seems that the intent is more 
important.  For the first 5 years at Hogwart's, students are taught 
to cast their spells verbally.  I think that by saying the words, 
one focuses more on the intent.  In sixth year, they start learning 
the nonverbal method.  They must re-train their brains to be able to 
focus on the intent without speaking the words.  Perhaps the way 
you "think" the words will affect whether the spell works or not.  

Food for thought.

ibchawz