Fractional
/ˈfɹæk.ʃən.əl/
"Fractional" in a Sentence (3 examples)
The two women exchanged a glance, then a fractional nod of agreement.
In English, most ordinals double as fractionals — "third", "fourth", and so on — with the exception of "second", whose corresponding fractional is "half".
A fractional is much more expensive than a traditional timeshare, but to many people, it's worth it.