va-t-il What does the -t-il mean?

Question

I know now that it means " does he go, " but the average person reading this wouldn't know that. -T-il is perhaps the most confusing thing about French question-making. What does the -t- even mean? Can't mean tu or te judging by the context, so why's it there? Just for phonetic reasons, like the l' in si l'on? This should really be explained in the lesson, what -t-il means.

Answer

The "t" is just interposed to prevent two vowels from clashing, is all. Nothing deep, no reference to anything grammatical. sometimes things really are simple ;))
-- Chris.

Answer

Oh good, so like the l in si l'on, just like I suspected. Still, I wish that was included in the lesson, if only as a side-note considering it's something you need to know to be able to answer one of the micro-quizes.

Answer

Wikipedia explains that the -t- is a residue of the ending
of the verb in the third person singular. For exemple: ego habeo, tu habes, ille habet, I
have, you have, he has. See https://en.wiktionary.org/wiki/a-t-il
e https://en.wiktionary.org/wiki/-t-.

Answer

I was told by a native French teacher that  this "t" was referred to as a phonème éphelcystique.