I would have given the same answer as @absalom. This is an old expression and rather literary.
Another use (this one an adjective, not noun as in the original question) is “to be wont to,” meaning to be used to or accustomed to. This expression is about custom or habit, not tendency. Example:
She was wont to begin her breakfast with lavish helpings of jam on toast.
It means she was used to doing that—it was her routine.
Sometime you see “wont’ in another form, namely, “wonted.” Example:
I found them sunning themselves in their wonted place at the edge of the cliff overlooking the long valley.
It means their usual or customary place. This too is much more likely to turn up in literature than in conversation.