That was a long list of questions. Taking a deep breath, Janice raised up her hand and answered.
"Incantation is a word or phrase that you say to, err, in order to have effect/s. Some wizards, though, can throw out spells without sayong the incantations, or even do it without a wand, more commonly known as non-verbal or wandless spells. Most incantations re Latin words, although some of them uses English like the 'Point Me!' spell. Incantations chosen are usually related to the spell they're trying to make, for example Aguamenti, Agua, Aqua, you know."