persistent


per·sis·tent

adjective \pər-ˈsis-tənt, -ˈzis-\

: continuing to do something or to try to do something even though it is difficult or other people want you to stop

: continuing beyond the usual, expected, or normal time : not stopping or going away

Full Definition of PERSISTENT

1
:  existing for a long or longer than usual time or continuously: as
a :  retained beyond the usual period <a persistent leaf>
b :  continuing without change in function or structure <persistent gills>
c :  effective in the open for an appreciable time usually through slow volatilizing <mustard gas is persistent>
d :  degraded only slowly by the environment <persistent pesticides>
e :  remaining infective for a relatively long time in a vector after an initial period of incubation <persistent viruses>
2
a :  continuing or inclined to persist in a course(see persist)
b :  continuing to exist despite interference or treatment <a persistent cough> <has been in a persistent vegetative state for two years>
per·sis·tent·ly adverb

Examples of PERSISTENT

  1. We were nagged by a persistent salesman.
  2. He is one of the government's most persistent critics.
  3. She has been persistent in pursuing the job.
  4. He has been fighting a persistent cold.
  5. Flooding has been a persistent problem in the area this year.
  6. Persistent rumors that the business is for sale have alarmed the staff.
  7. Contrary to persistent myth, Hoover was an activist. —Steve Forbes, Forbes, 30 June 2008

Origin of PERSISTENT

Latin persistent-, persistens, present participle of persistere (see persist)
First Known Use: 1826

per·sis·tent

adjective \-tənt\   (Medical Dictionary)

Medical Definition of PERSISTENT

1
: existing or continuing for a long time: as a : effective in the open for an appreciable time usually through slow volatilizing <mustard gas is persistent> b : degraded only slowly by the environment <persistent pesticides> c : remaining infective for a relatively long time in a vector after an initial period of incubation <persistent viruses>
2
: continuing to exist despite interference or treatment <a persistent cough> <has been in a persistent vegetative state for two years>

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