Persistency

Webster's Dictionary of the English Language

·noun The persistence of motion.

II. Persistency ·noun The continuance of an effect after the cause which first gave rise to it is removed.

III. Persistency ·noun Visual persistence, or persistence of the visual impression; auditory persistence, ·etc.

IV. Persistency ·noun The quality or state of being persistent; staying or continuing quality; hence, in an unfavorable sense, doggedness; obstinacy.