Incantations vs. spells

[justcarol67]

No: HPFGUIDX 97308

I've recently noticed several people using the term "incantation" as
synonymous with "spell." My perception is that an incantation is not a
one- or two-word command like "lumos!" or "wingardium leviosa!" but a
chant that's spoken or sung as a kind of ritual, often but not always
as part of the making of a complex potion. The classic example is the
"double, double, toil and trouble" scene with the Three Witches in
"Macbeth." The Barrow Wight in "Fellowship of the Ring" also chants an
incantation "Cold be hand and heart and bone. . . ." The closest thing
in HP to an incantation by this definition is the words Wormtail
speaks as he tosses body parts and blood into the cauldron to restore
Voldemort's body, not a full-fledged chant, but at least longish
phrases with a parallel structure: "Flesh of the servant, w-willingly
given," for example, though I don't think the potion maker is supposed
to stammer.

Does anyone else agree with me that this is the proper sense of the
word "incantation" and that everything else we've seen so far, from
Reparo to Avada Kedavra, is just a spell (regardless of whether it's a
charm, a jinx, a hex, or a curse)? And can anyone point to a passage
where the word "incantation" is actually used in the HP books? I can't
recall whether it's used in the graveyard scene or not. If not, the
absence might simply reflect Harry's unfamiliarity with the term. (I
know he's not the narrator, but the POV is his.) 

And are there any other examples of actual incantations that I'm
overlooking? (Possibly Snape has to recite one when he makes the
wolfbane potion. We don't hear him doing it, but that doesn't mean an
incantation isn't involved. In my view, it would at least fit with the
complexity of that particular potion.)

Carol, who hopes she's not making a mountain out of a molehill