Definition of one-party:
(n) :
The digit or figure 1.
(n) :
(by ellipsis) Used to briefly refer to a noun phrase understood by context
(n) :
(US) A one-dollar bill.
(n) :
One o'clock, either a.m. or p.m.
(adj) :
Being a single, unspecified thing; a; any.
(adj) :
Sole, only.