Incantatem doesn't have a definition, it's part of a spell "Finite Incantatem" which is a general counter-spell.
It is a pseudo Latin style word. An "incantation" is the act of using words that have a magical effect when vocalised. The spell above could be pseudo translated as "Stop Incantation" "Fin" meaning stop/end from the Latin "Finem".
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Finite incantatem. It does other stuff too, but that is one of them:) ~PippiQ Pembrooke
He's the main character, one of the protagonists of the book, and I don't know what you mean about 'role', but I guess it's to defeat Voldemort if that's what you mean.
HARRY POTTER YOU DUMMY!!!!!
That is just a name they came up with for Harry Potter.
"Hedwig's Theme" is kind of the signature song for Harry Potter, if that's what you mean.