Persistency :: Persistency (n.) The quality or state of being persistent; staying or continuing quality; hence, in an unfavorable sense, doggedness; obstinacy..
Persistency :: Persistency (n.) The continuance of an effect after the cause which first gave rise to it is remove.
Persistency :: Persistency (n.) Visual persistence, or persistence of the visual impression; auditory persistence, etc..
Persistent :: Persistent (a.) Inclined to persist; having staying qualities; tenacious of position or purpose.
Persistent :: Persistent (a.) Remaining beyond the period when parts of the same kind sometimes fall off or are absorbed; permanent; as, persistent teeth or gills; a persistent calyx; -- opposed to deciduous, and caducous..