Yes, but usually not. The only “meaningless” encounters have been the disappointing ones.

We were watching a show on TV and that was one of the questions they brought up, could you have sex with someone and just move on and not think about that person again!
I have just had sex with someone just to have the sensation of sex, no commitment, just sex and a thank you!

There's no money involved right?

Enjoy each other and orgasm. Want to decide on a day to get what we want again, fine. If it was only one time, it is sexual release that will make you feel better.

Yes... but, with some qualifications. First, "casual sex" can mean so many things and many are different for each person. Next, is the meaning of "meaning," which may or may not entail emotions, or if so to some personal degree. Now, that said for me I could imagine a glory-hole, for example and it would entail no emotion and be about as casual as possible... for me.