ELI5: Explain Like I'm 5

Twixteen

Okay little buddy, imagine you have a big sister who is almost 16 years old, but not quite there yet. She is what we call "in between" being 15 and being 16. We can call her a "twixteen" because she is in between those two ages.

Well, "twixteen" is also a word that people use when they want to describe things that are in between two other things. It is like when you have a crayon that is not really red, but it's also not really pink. We might say it is "twixt" red and pink, or "twixt" the two colors.

So "twixteen" basically means something that is in between two other things, just like your big sister who is in between being 15 and 16 years old. Easy peasy, right?