Definify.com
Webster 1913 Edition
Persistency
1.
The quality or state of being persistent; staying or continuing quality; hence, in an unfavorable sense, doggedness; obstinacy.
2.
The continuance of an effect after the cause which first gave rise to it is removed
; as: (a)
(Physics)
The
persistence
of motion. (b)
(Physiol.)
Visual
persistence
, or persistence
of the visual impression; auditory persistence
, etc.