1. Referring to someone who is tenacious or determined despite problems and difficulties: Sally has been a persistent worker in striving to achieve the company's objectives.
2. Pertaining to something which is incessant or unrelenting or which exists or continues for an unpleasantly long time: Extremely bad weather conditions have been a persistent problem in many parts of the country during the past winters.
3. Descriptive of something that is constantly repeated or continued: Many carpenters have been making persistent efforts in repairing the damage done by the recent tornado. © ALL rights are reserved.

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A pesticide compound that remains in the environment for relatively long periods.

The extent of its persistence depends on several factors; such as, the tkype of soil, iots moisture, temperature, and pH, and the extent of cultivation and cover crops.

A type of coma in which the patient shows alternating sleep and wake cycles: "As a result of a severe damage to certain areas of the brain, the person is unconscious when he or she is in the persistent vegetative coma, even when that patient appears to be awake."