Definition of one-shots:
(adj) :
Needing only a single attempt to become effective.
(adj) :
Unique; occurring only once.
(adj) :
Performing all the necessary steps on every occurrence, rather than relying on previous setup.
(adj) :
(research design) Measuring something at a single point in time, with no control group.
(adj) :
Pertaining to a single shot.
(adj) :
Involving a single gunshot.